glib/docs/reference/glib/html/glib-GDateTime.html - nest-cam/4320010/glib - Git at Google

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                   <a href="#glib-GDateTime.description" class="shortcut">Description</a></span>
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 <h2><span class="refentrytitle"><a name="glib-GDateTime.top_of_page"></a>GDateTime</span></h2>
 <p>GDateTime — a structure representing Date and Time</p>
 </td>
 <td class="gallery_image" valign="top" align="right"></td>
 </tr></table></div>
 <div class="refsect1">
 <a name="glib-GDateTime.functions"></a><h2>Functions</h2>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="functions_return">
 <col class="functions_name">
 </colgroup>
 <tbody>
 <tr>
 <td class="function_type">
 <span class="returnvalue">void</span>
 </td>
 <td class="function_name">
 <a class="link" href="glib-GDateTime.html#g-date-time-unref" title="g_date_time_unref ()">g_date_time_unref</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="returnvalue">GDateTime</span></a> *
 </td>
 <td class="function_name">
 <a class="link" href="glib-GDateTime.html#g-date-time-ref" title="g_date_time_ref ()">g_date_time_ref</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="returnvalue">GDateTime</span></a> *
 </td>
 <td class="function_name">
 <a class="link" href="glib-GDateTime.html#g-date-time-new-now" title="g_date_time_new_now ()">g_date_time_new_now</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="returnvalue">GDateTime</span></a> *
 </td>
 <td class="function_name">
 <a class="link" href="glib-GDateTime.html#g-date-time-new-now-local" title="g_date_time_new_now_local ()">g_date_time_new_now_local</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="returnvalue">GDateTime</span></a> *
 </td>
 <td class="function_name">
 <a class="link" href="glib-GDateTime.html#g-date-time-new-now-utc" title="g_date_time_new_now_utc ()">g_date_time_new_now_utc</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="returnvalue">GDateTime</span></a> *
 </td>
 <td class="function_name">
 <a class="link" href="glib-GDateTime.html#g-date-time-new-from-unix-local" title="g_date_time_new_from_unix_local ()">g_date_time_new_from_unix_local</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="returnvalue">GDateTime</span></a> *
 </td>
 <td class="function_name">
 <a class="link" href="glib-GDateTime.html#g-date-time-new-from-unix-utc" title="g_date_time_new_from_unix_utc ()">g_date_time_new_from_unix_utc</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="returnvalue">GDateTime</span></a> *
 </td>
 <td class="function_name">
 <a class="link" href="glib-GDateTime.html#g-date-time-new-from-timeval-local" title="g_date_time_new_from_timeval_local ()">g_date_time_new_from_timeval_local</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="returnvalue">GDateTime</span></a> *
 </td>
 <td class="function_name">
 <a class="link" href="glib-GDateTime.html#g-date-time-new-from-timeval-utc" title="g_date_time_new_from_timeval_utc ()">g_date_time_new_from_timeval_utc</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="returnvalue">GDateTime</span></a> *
 </td>
 <td class="function_name">
 <a class="link" href="glib-GDateTime.html#g-date-time-new" title="g_date_time_new ()">g_date_time_new</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="returnvalue">GDateTime</span></a> *
 </td>
 <td class="function_name">
 <a class="link" href="glib-GDateTime.html#g-date-time-new-local" title="g_date_time_new_local ()">g_date_time_new_local</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="returnvalue">GDateTime</span></a> *
 </td>
 <td class="function_name">
 <a class="link" href="glib-GDateTime.html#g-date-time-new-utc" title="g_date_time_new_utc ()">g_date_time_new_utc</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="returnvalue">GDateTime</span></a> *
 </td>
 <td class="function_name">
 <a class="link" href="glib-GDateTime.html#g-date-time-add" title="g_date_time_add ()">g_date_time_add</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="returnvalue">GDateTime</span></a> *
 </td>
 <td class="function_name">
 <a class="link" href="glib-GDateTime.html#g-date-time-add-years" title="g_date_time_add_years ()">g_date_time_add_years</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="returnvalue">GDateTime</span></a> *
 </td>
 <td class="function_name">
 <a class="link" href="glib-GDateTime.html#g-date-time-add-months" title="g_date_time_add_months ()">g_date_time_add_months</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="returnvalue">GDateTime</span></a> *
 </td>
 <td class="function_name">
 <a class="link" href="glib-GDateTime.html#g-date-time-add-weeks" title="g_date_time_add_weeks ()">g_date_time_add_weeks</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="returnvalue">GDateTime</span></a> *
 </td>
 <td class="function_name">
 <a class="link" href="glib-GDateTime.html#g-date-time-add-days" title="g_date_time_add_days ()">g_date_time_add_days</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="returnvalue">GDateTime</span></a> *
 </td>
 <td class="function_name">
 <a class="link" href="glib-GDateTime.html#g-date-time-add-hours" title="g_date_time_add_hours ()">g_date_time_add_hours</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="returnvalue">GDateTime</span></a> *
 </td>
 <td class="function_name">
 <a class="link" href="glib-GDateTime.html#g-date-time-add-minutes" title="g_date_time_add_minutes ()">g_date_time_add_minutes</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="returnvalue">GDateTime</span></a> *
 </td>
 <td class="function_name">
 <a class="link" href="glib-GDateTime.html#g-date-time-add-seconds" title="g_date_time_add_seconds ()">g_date_time_add_seconds</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="returnvalue">GDateTime</span></a> *
 </td>
 <td class="function_name">
 <a class="link" href="glib-GDateTime.html#g-date-time-add-full" title="g_date_time_add_full ()">g_date_time_add_full</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a class="link" href="glib-Basic-Types.html#gint" title="gint ()"><span class="returnvalue">gint</span></a>
 </td>
 <td class="function_name">
 <a class="link" href="glib-GDateTime.html#g-date-time-compare" title="g_date_time_compare ()">g_date_time_compare</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a class="link" href="glib-GDateTime.html#GTimeSpan" title="GTimeSpan"><span class="returnvalue">GTimeSpan</span></a>
 </td>
 <td class="function_name">
 <a class="link" href="glib-GDateTime.html#g-date-time-difference" title="g_date_time_difference ()">g_date_time_difference</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a class="link" href="glib-Basic-Types.html#guint" title="guint ()"><span class="returnvalue">guint</span></a>
 </td>
 <td class="function_name">
 <a class="link" href="glib-GDateTime.html#g-date-time-hash" title="g_date_time_hash ()">g_date_time_hash</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a class="link" href="glib-Basic-Types.html#gboolean" title="gboolean"><span class="returnvalue">gboolean</span></a>
 </td>
 <td class="function_name">
 <a class="link" href="glib-GDateTime.html#g-date-time-equal" title="g_date_time_equal ()">g_date_time_equal</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <span class="returnvalue">void</span>
 </td>
 <td class="function_name">
 <a class="link" href="glib-GDateTime.html#g-date-time-get-ymd" title="g_date_time_get_ymd ()">g_date_time_get_ymd</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a class="link" href="glib-Basic-Types.html#gint" title="gint ()"><span class="returnvalue">gint</span></a>
 </td>
 <td class="function_name">
 <a class="link" href="glib-GDateTime.html#g-date-time-get-year" title="g_date_time_get_year ()">g_date_time_get_year</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a class="link" href="glib-Basic-Types.html#gint" title="gint ()"><span class="returnvalue">gint</span></a>
 </td>
 <td class="function_name">
 <a class="link" href="glib-GDateTime.html#g-date-time-get-month" title="g_date_time_get_month ()">g_date_time_get_month</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a class="link" href="glib-Basic-Types.html#gint" title="gint ()"><span class="returnvalue">gint</span></a>
 </td>
 <td class="function_name">
 <a class="link" href="glib-GDateTime.html#g-date-time-get-day-of-month" title="g_date_time_get_day_of_month ()">g_date_time_get_day_of_month</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a class="link" href="glib-Basic-Types.html#gint" title="gint ()"><span class="returnvalue">gint</span></a>
 </td>
 <td class="function_name">
 <a class="link" href="glib-GDateTime.html#g-date-time-get-week-numbering-year" title="g_date_time_get_week_numbering_year ()">g_date_time_get_week_numbering_year</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a class="link" href="glib-Basic-Types.html#gint" title="gint ()"><span class="returnvalue">gint</span></a>
 </td>
 <td class="function_name">
 <a class="link" href="glib-GDateTime.html#g-date-time-get-week-of-year" title="g_date_time_get_week_of_year ()">g_date_time_get_week_of_year</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a class="link" href="glib-Basic-Types.html#gint" title="gint ()"><span class="returnvalue">gint</span></a>
 </td>
 <td class="function_name">
 <a class="link" href="glib-GDateTime.html#g-date-time-get-day-of-week" title="g_date_time_get_day_of_week ()">g_date_time_get_day_of_week</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a class="link" href="glib-Basic-Types.html#gint" title="gint ()"><span class="returnvalue">gint</span></a>
 </td>
 <td class="function_name">
 <a class="link" href="glib-GDateTime.html#g-date-time-get-day-of-year" title="g_date_time_get_day_of_year ()">g_date_time_get_day_of_year</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a class="link" href="glib-Basic-Types.html#gint" title="gint ()"><span class="returnvalue">gint</span></a>
 </td>
 <td class="function_name">
 <a class="link" href="glib-GDateTime.html#g-date-time-get-hour" title="g_date_time_get_hour ()">g_date_time_get_hour</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a class="link" href="glib-Basic-Types.html#gint" title="gint ()"><span class="returnvalue">gint</span></a>
 </td>
 <td class="function_name">
 <a class="link" href="glib-GDateTime.html#g-date-time-get-minute" title="g_date_time_get_minute ()">g_date_time_get_minute</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a class="link" href="glib-Basic-Types.html#gint" title="gint ()"><span class="returnvalue">gint</span></a>
 </td>
 <td class="function_name">
 <a class="link" href="glib-GDateTime.html#g-date-time-get-second" title="g_date_time_get_second ()">g_date_time_get_second</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a class="link" href="glib-Basic-Types.html#gint" title="gint ()"><span class="returnvalue">gint</span></a>
 </td>
 <td class="function_name">
 <a class="link" href="glib-GDateTime.html#g-date-time-get-microsecond" title="g_date_time_get_microsecond ()">g_date_time_get_microsecond</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a class="link" href="glib-Basic-Types.html#gdouble" title="gdouble"><span class="returnvalue">gdouble</span></a>
 </td>
 <td class="function_name">
 <a class="link" href="glib-GDateTime.html#g-date-time-get-seconds" title="g_date_time_get_seconds ()">g_date_time_get_seconds</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a class="link" href="glib-Basic-Types.html#gint64" title="gint64"><span class="returnvalue">gint64</span></a>
 </td>
 <td class="function_name">
 <a class="link" href="glib-GDateTime.html#g-date-time-to-unix" title="g_date_time_to_unix ()">g_date_time_to_unix</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a class="link" href="glib-Basic-Types.html#gboolean" title="gboolean"><span class="returnvalue">gboolean</span></a>
 </td>
 <td class="function_name">
 <a class="link" href="glib-GDateTime.html#g-date-time-to-timeval" title="g_date_time_to_timeval ()">g_date_time_to_timeval</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a class="link" href="glib-GDateTime.html#GTimeSpan" title="GTimeSpan"><span class="returnvalue">GTimeSpan</span></a>
 </td>
 <td class="function_name">
 <a class="link" href="glib-GDateTime.html#g-date-time-get-utc-offset" title="g_date_time_get_utc_offset ()">g_date_time_get_utc_offset</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">const <a class="link" href="glib-Basic-Types.html#gchar" title="gchar"><span class="returnvalue">gchar</span></a> *
 </td>
 <td class="function_name">
 <a class="link" href="glib-GDateTime.html#g-date-time-get-timezone-abbreviation" title="g_date_time_get_timezone_abbreviation ()">g_date_time_get_timezone_abbreviation</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a class="link" href="glib-Basic-Types.html#gboolean" title="gboolean"><span class="returnvalue">gboolean</span></a>
 </td>
 <td class="function_name">
 <a class="link" href="glib-GDateTime.html#g-date-time-is-daylight-savings" title="g_date_time_is_daylight_savings ()">g_date_time_is_daylight_savings</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="returnvalue">GDateTime</span></a> *
 </td>
 <td class="function_name">
 <a class="link" href="glib-GDateTime.html#g-date-time-to-timezone" title="g_date_time_to_timezone ()">g_date_time_to_timezone</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="returnvalue">GDateTime</span></a> *
 </td>
 <td class="function_name">
 <a class="link" href="glib-GDateTime.html#g-date-time-to-local" title="g_date_time_to_local ()">g_date_time_to_local</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="returnvalue">GDateTime</span></a> *
 </td>
 <td class="function_name">
 <a class="link" href="glib-GDateTime.html#g-date-time-to-utc" title="g_date_time_to_utc ()">g_date_time_to_utc</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a class="link" href="glib-Basic-Types.html#gchar" title="gchar"><span class="returnvalue">gchar</span></a> *
 </td>
 <td class="function_name">
 <a class="link" href="glib-GDateTime.html#g-date-time-format" title="g_date_time_format ()">g_date_time_format</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <div class="refsect1">
 <a name="glib-GDateTime.other"></a><h2>Types and Values</h2>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="name">
 <col class="description">
 </colgroup>
 <tbody>
 <tr>
 <td class="typedef_keyword">typedef</td>
 <td class="function_name"><a class="link" href="glib-GDateTime.html#GTimeSpan" title="GTimeSpan">GTimeSpan</a></td>
 </tr>
 <tr>
 <td class="define_keyword">#define</td>
 <td class="function_name"><a class="link" href="glib-GDateTime.html#G-TIME-SPAN-DAY:CAPS" title="G_TIME_SPAN_DAY">G_TIME_SPAN_DAY</a></td>
 </tr>
 <tr>
 <td class="define_keyword">#define</td>
 <td class="function_name"><a class="link" href="glib-GDateTime.html#G-TIME-SPAN-HOUR:CAPS" title="G_TIME_SPAN_HOUR">G_TIME_SPAN_HOUR</a></td>
 </tr>
 <tr>
 <td class="define_keyword">#define</td>
 <td class="function_name"><a class="link" href="glib-GDateTime.html#G-TIME-SPAN-MINUTE:CAPS" title="G_TIME_SPAN_MINUTE">G_TIME_SPAN_MINUTE</a></td>
 </tr>
 <tr>
 <td class="define_keyword">#define</td>
 <td class="function_name"><a class="link" href="glib-GDateTime.html#G-TIME-SPAN-SECOND:CAPS" title="G_TIME_SPAN_SECOND">G_TIME_SPAN_SECOND</a></td>
 </tr>
 <tr>
 <td class="define_keyword">#define</td>
 <td class="function_name"><a class="link" href="glib-GDateTime.html#G-TIME-SPAN-MILLISECOND:CAPS" title="G_TIME_SPAN_MILLISECOND">G_TIME_SPAN_MILLISECOND</a></td>
 </tr>
 <tr>
 <td class="datatype_keyword"> </td>
 <td class="function_name"><a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime">GDateTime</a></td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <div class="refsect1">
 <a name="glib-GDateTime.includes"></a><h2>Includes</h2>
 <pre class="synopsis">#include &lt;glib.h&gt;
 </pre>
 </div>
 <div class="refsect1">
 <a name="glib-GDateTime.description"></a><h2>Description</h2>
 <p><a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="type">GDateTime</span></a> is a structure that combines a Gregorian date and time
 into a single structure.  It provides many conversion and methods to
 manipulate dates and times.  Time precision is provided down to
 microseconds and the time can range (proleptically) from 0001-01-01
 00:00:00 to 9999-12-31 23:59:59.999999.  <a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="type">GDateTime</span></a> follows POSIX
 time in the sense that it is oblivious to leap seconds.</p>
 <p><a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="type">GDateTime</span></a> is an immutable object; once it has been created it cannot
 be modified further.  All modifiers will create a new <a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="type">GDateTime</span></a>.
 Nearly all such functions can fail due to the date or time going out
 of range, in which case <a class="link" href="glib-Standard-Macros.html#NULL:CAPS" title="NULL"><code class="literal">NULL</code></a> will be returned.</p>
 <p><a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="type">GDateTime</span></a> is reference counted: the reference count is increased by calling
 <a class="link" href="glib-GDateTime.html#g-date-time-ref" title="g_date_time_ref ()"><code class="function">g_date_time_ref()</code></a> and decreased by calling <a class="link" href="glib-GDateTime.html#g-date-time-unref" title="g_date_time_unref ()"><code class="function">g_date_time_unref()</code></a>. When the
 reference count drops to 0, the resources allocated by the <a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="type">GDateTime</span></a>
 structure are released.</p>
 <p>Many parts of the API may produce non-obvious results.  As an
 example, adding two months to January 31st will yield March 31st
 whereas adding one month and then one month again will yield either
 March 28th or March 29th.  Also note that adding 24 hours is not
 always the same as adding one day (since days containing daylight
 savings time transitions are either 23 or 25 hours in length).</p>
 <p><a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="type">GDateTime</span></a> is available since GLib 2.26.</p>
 </div>
 <div class="refsect1">
 <a name="glib-GDateTime.functions_details"></a><h2>Functions</h2>
 <div class="refsect2">
 <a name="g-date-time-unref"></a><h3>g_date_time_unref ()</h3>
 <pre class="programlisting"><span class="returnvalue">void</span>
 g_date_time_unref (<em class="parameter"><code><a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="type">GDateTime</span></a> *datetime</code></em>);</pre>
 <p>Atomically decrements the reference count of <em class="parameter"><code>datetime</code></em>
  by one.</p>
 <p>When the reference count reaches zero, the resources allocated by
 <em class="parameter"><code>datetime</code></em>
  are freed</p>
 <div class="refsect3">
 <a name="g-date-time-unref.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody><tr>
 <td class="parameter_name"><p>datetime</p></td>
 <td class="parameter_description"><p>a <a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="type">GDateTime</span></a></p></td>
 <td class="parameter_annotations"> </td>
 </tr></tbody>
 </table></div>
 </div>
 <p class="since">Since: <a class="link" href="api-index-2-26.html#api-index-2.26">2.26</a></p>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-date-time-ref"></a><h3>g_date_time_ref ()</h3>
 <pre class="programlisting"><a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="returnvalue">GDateTime</span></a> *
 g_date_time_ref (<em class="parameter"><code><a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="type">GDateTime</span></a> *datetime</code></em>);</pre>
 <p>Atomically increments the reference count of <em class="parameter"><code>datetime</code></em>
  by one.</p>
 <div class="refsect3">
 <a name="g-date-time-ref.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody><tr>
 <td class="parameter_name"><p>datetime</p></td>
 <td class="parameter_description"><p>a <a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="type">GDateTime</span></a></p></td>
 <td class="parameter_annotations"> </td>
 </tr></tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="g-date-time-ref.returns"></a><h4>Returns</h4>
 <p> the <a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="type">GDateTime</span></a> with the reference count increased</p>
 </div>
 <p class="since">Since: <a class="link" href="api-index-2-26.html#api-index-2.26">2.26</a></p>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-date-time-new-now"></a><h3>g_date_time_new_now ()</h3>
 <pre class="programlisting"><a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="returnvalue">GDateTime</span></a> *
 g_date_time_new_now (<em class="parameter"><code><a class="link" href="glib-GTimeZone.html#GTimeZone" title="GTimeZone"><span class="type">GTimeZone</span></a> *tz</code></em>);</pre>
 <p>Creates a <a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="type">GDateTime</span></a> corresponding to this exact instant in the given
 time zone <em class="parameter"><code>tz</code></em>
 .  The time is as accurate as the system allows, to a
 maximum accuracy of 1 microsecond.</p>
 <p>This function will always succeed unless the system clock is set to
 truly insane values (or unless GLib is still being used after the
 year 9999).</p>
 <p>You should release the return value by calling <a class="link" href="glib-GDateTime.html#g-date-time-unref" title="g_date_time_unref ()"><code class="function">g_date_time_unref()</code></a>
 when you are done with it.</p>
 <div class="refsect3">
 <a name="g-date-time-new-now.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody><tr>
 <td class="parameter_name"><p>tz</p></td>
 <td class="parameter_description"><p>a <a class="link" href="glib-GTimeZone.html#GTimeZone" title="GTimeZone"><span class="type">GTimeZone</span></a></p></td>
 <td class="parameter_annotations"> </td>
 </tr></tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="g-date-time-new-now.returns"></a><h4>Returns</h4>
 <p> a new <a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="type">GDateTime</span></a>, or <a class="link" href="glib-Standard-Macros.html#NULL:CAPS" title="NULL"><code class="literal">NULL</code></a></p>
 </div>
 <p class="since">Since: <a class="link" href="api-index-2-26.html#api-index-2.26">2.26</a></p>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-date-time-new-now-local"></a><h3>g_date_time_new_now_local ()</h3>
 <pre class="programlisting"><a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="returnvalue">GDateTime</span></a> *
 g_date_time_new_now_local (<em class="parameter"><code><span class="type">void</span></code></em>);</pre>
 <p>Creates a <a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="type">GDateTime</span></a> corresponding to this exact instant in the local
 time zone.</p>
 <p>This is equivalent to calling <a class="link" href="glib-GDateTime.html#g-date-time-new-now" title="g_date_time_new_now ()"><code class="function">g_date_time_new_now()</code></a> with the time
 zone returned by <a class="link" href="glib-GTimeZone.html#g-time-zone-new-local" title="g_time_zone_new_local ()"><code class="function">g_time_zone_new_local()</code></a>.</p>
 <div class="refsect3">
 <a name="g-date-time-new-now-local.returns"></a><h4>Returns</h4>
 <p> a new <a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="type">GDateTime</span></a>, or <a class="link" href="glib-Standard-Macros.html#NULL:CAPS" title="NULL"><code class="literal">NULL</code></a></p>
 </div>
 <p class="since">Since: <a class="link" href="api-index-2-26.html#api-index-2.26">2.26</a></p>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-date-time-new-now-utc"></a><h3>g_date_time_new_now_utc ()</h3>
 <pre class="programlisting"><a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="returnvalue">GDateTime</span></a> *
 g_date_time_new_now_utc (<em class="parameter"><code><span class="type">void</span></code></em>);</pre>
 <p>Creates a <a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="type">GDateTime</span></a> corresponding to this exact instant in UTC.</p>
 <p>This is equivalent to calling <a class="link" href="glib-GDateTime.html#g-date-time-new-now" title="g_date_time_new_now ()"><code class="function">g_date_time_new_now()</code></a> with the time
 zone returned by <a class="link" href="glib-GTimeZone.html#g-time-zone-new-utc" title="g_time_zone_new_utc ()"><code class="function">g_time_zone_new_utc()</code></a>.</p>
 <div class="refsect3">
 <a name="g-date-time-new-now-utc.returns"></a><h4>Returns</h4>
 <p> a new <a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="type">GDateTime</span></a>, or <a class="link" href="glib-Standard-Macros.html#NULL:CAPS" title="NULL"><code class="literal">NULL</code></a></p>
 </div>
 <p class="since">Since: <a class="link" href="api-index-2-26.html#api-index-2.26">2.26</a></p>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-date-time-new-from-unix-local"></a><h3>g_date_time_new_from_unix_local ()</h3>
 <pre class="programlisting"><a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="returnvalue">GDateTime</span></a> *
 g_date_time_new_from_unix_local (<em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gint64" title="gint64"><span class="type">gint64</span></a> t</code></em>);</pre>
 <p>Creates a <a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="type">GDateTime</span></a> corresponding to the given Unix time <em class="parameter"><code>t</code></em>
  in the
 local time zone.</p>
 <p>Unix time is the number of seconds that have elapsed since 1970-01-01
 00:00:00 UTC, regardless of the local time offset.</p>
 <p>This call can fail (returning <a class="link" href="glib-Standard-Macros.html#NULL:CAPS" title="NULL"><code class="literal">NULL</code></a>) if <em class="parameter"><code>t</code></em>
  represents a time outside
 of the supported range of <a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="type">GDateTime</span></a>.</p>
 <p>You should release the return value by calling <a class="link" href="glib-GDateTime.html#g-date-time-unref" title="g_date_time_unref ()"><code class="function">g_date_time_unref()</code></a>
 when you are done with it.</p>
 <div class="refsect3">
 <a name="g-date-time-new-from-unix-local.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody><tr>
 <td class="parameter_name"><p>t</p></td>
 <td class="parameter_description"><p>the Unix time</p></td>
 <td class="parameter_annotations"> </td>
 </tr></tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="g-date-time-new-from-unix-local.returns"></a><h4>Returns</h4>
 <p> a new <a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="type">GDateTime</span></a>, or <a class="link" href="glib-Standard-Macros.html#NULL:CAPS" title="NULL"><code class="literal">NULL</code></a></p>
 </div>
 <p class="since">Since: <a class="link" href="api-index-2-26.html#api-index-2.26">2.26</a></p>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-date-time-new-from-unix-utc"></a><h3>g_date_time_new_from_unix_utc ()</h3>
 <pre class="programlisting"><a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="returnvalue">GDateTime</span></a> *
 g_date_time_new_from_unix_utc (<em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gint64" title="gint64"><span class="type">gint64</span></a> t</code></em>);</pre>
 <p>Creates a <a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="type">GDateTime</span></a> corresponding to the given Unix time <em class="parameter"><code>t</code></em>
  in UTC.</p>
 <p>Unix time is the number of seconds that have elapsed since 1970-01-01
 00:00:00 UTC.</p>
 <p>This call can fail (returning <a class="link" href="glib-Standard-Macros.html#NULL:CAPS" title="NULL"><code class="literal">NULL</code></a>) if <em class="parameter"><code>t</code></em>
  represents a time outside
 of the supported range of <a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="type">GDateTime</span></a>.</p>
 <p>You should release the return value by calling <a class="link" href="glib-GDateTime.html#g-date-time-unref" title="g_date_time_unref ()"><code class="function">g_date_time_unref()</code></a>
 when you are done with it.</p>
 <div class="refsect3">
 <a name="g-date-time-new-from-unix-utc.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody><tr>
 <td class="parameter_name"><p>t</p></td>
 <td class="parameter_description"><p>the Unix time</p></td>
 <td class="parameter_annotations"> </td>
 </tr></tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="g-date-time-new-from-unix-utc.returns"></a><h4>Returns</h4>
 <p> a new <a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="type">GDateTime</span></a>, or <a class="link" href="glib-Standard-Macros.html#NULL:CAPS" title="NULL"><code class="literal">NULL</code></a></p>
 </div>
 <p class="since">Since: <a class="link" href="api-index-2-26.html#api-index-2.26">2.26</a></p>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-date-time-new-from-timeval-local"></a><h3>g_date_time_new_from_timeval_local ()</h3>
 <pre class="programlisting"><a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="returnvalue">GDateTime</span></a> *
 g_date_time_new_from_timeval_local (<em class="parameter"><code>const <a class="link" href="glib-Date-and-Time-Functions.html#GTimeVal" title="struct GTimeVal"><span class="type">GTimeVal</span></a> *tv</code></em>);</pre>
 <p>Creates a <a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="type">GDateTime</span></a> corresponding to the given <a class="link" href="glib-Date-and-Time-Functions.html#GTimeVal" title="struct GTimeVal"><span class="type">GTimeVal</span></a> <em class="parameter"><code>tv</code></em>
  in the
 local time zone.</p>
 <p>The time contained in a <a class="link" href="glib-Date-and-Time-Functions.html#GTimeVal" title="struct GTimeVal"><span class="type">GTimeVal</span></a> is always stored in the form of
 seconds elapsed since 1970-01-01 00:00:00 UTC, regardless of the
 local time offset.</p>
 <p>This call can fail (returning <a class="link" href="glib-Standard-Macros.html#NULL:CAPS" title="NULL"><code class="literal">NULL</code></a>) if <em class="parameter"><code>tv</code></em>
  represents a time outside
 of the supported range of <a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="type">GDateTime</span></a>.</p>
 <p>You should release the return value by calling <a class="link" href="glib-GDateTime.html#g-date-time-unref" title="g_date_time_unref ()"><code class="function">g_date_time_unref()</code></a>
 when you are done with it.</p>
 <div class="refsect3">
 <a name="g-date-time-new-from-timeval-local.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody><tr>
 <td class="parameter_name"><p>tv</p></td>
 <td class="parameter_description"><p>a <a class="link" href="glib-Date-and-Time-Functions.html#GTimeVal" title="struct GTimeVal"><span class="type">GTimeVal</span></a></p></td>
 <td class="parameter_annotations"> </td>
 </tr></tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="g-date-time-new-from-timeval-local.returns"></a><h4>Returns</h4>
 <p> a new <a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="type">GDateTime</span></a>, or <a class="link" href="glib-Standard-Macros.html#NULL:CAPS" title="NULL"><code class="literal">NULL</code></a></p>
 </div>
 <p class="since">Since: <a class="link" href="api-index-2-26.html#api-index-2.26">2.26</a></p>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-date-time-new-from-timeval-utc"></a><h3>g_date_time_new_from_timeval_utc ()</h3>
 <pre class="programlisting"><a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="returnvalue">GDateTime</span></a> *
 g_date_time_new_from_timeval_utc (<em class="parameter"><code>const <a class="link" href="glib-Date-and-Time-Functions.html#GTimeVal" title="struct GTimeVal"><span class="type">GTimeVal</span></a> *tv</code></em>);</pre>
 <p>Creates a <a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="type">GDateTime</span></a> corresponding to the given <a class="link" href="glib-Date-and-Time-Functions.html#GTimeVal" title="struct GTimeVal"><span class="type">GTimeVal</span></a> <em class="parameter"><code>tv</code></em>
  in UTC.</p>
 <p>The time contained in a <a class="link" href="glib-Date-and-Time-Functions.html#GTimeVal" title="struct GTimeVal"><span class="type">GTimeVal</span></a> is always stored in the form of
 seconds elapsed since 1970-01-01 00:00:00 UTC.</p>
 <p>This call can fail (returning <a class="link" href="glib-Standard-Macros.html#NULL:CAPS" title="NULL"><code class="literal">NULL</code></a>) if <em class="parameter"><code>tv</code></em>
  represents a time outside
 of the supported range of <a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="type">GDateTime</span></a>.</p>
 <p>You should release the return value by calling <a class="link" href="glib-GDateTime.html#g-date-time-unref" title="g_date_time_unref ()"><code class="function">g_date_time_unref()</code></a>
 when you are done with it.</p>
 <div class="refsect3">
 <a name="g-date-time-new-from-timeval-utc.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody><tr>
 <td class="parameter_name"><p>tv</p></td>
 <td class="parameter_description"><p>a <a class="link" href="glib-Date-and-Time-Functions.html#GTimeVal" title="struct GTimeVal"><span class="type">GTimeVal</span></a></p></td>
 <td class="parameter_annotations"> </td>
 </tr></tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="g-date-time-new-from-timeval-utc.returns"></a><h4>Returns</h4>
 <p> a new <a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="type">GDateTime</span></a>, or <a class="link" href="glib-Standard-Macros.html#NULL:CAPS" title="NULL"><code class="literal">NULL</code></a></p>
 </div>
 <p class="since">Since: <a class="link" href="api-index-2-26.html#api-index-2.26">2.26</a></p>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-date-time-new"></a><h3>g_date_time_new ()</h3>
 <pre class="programlisting"><a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="returnvalue">GDateTime</span></a> *
 g_date_time_new (<em class="parameter"><code><a class="link" href="glib-GTimeZone.html#GTimeZone" title="GTimeZone"><span class="type">GTimeZone</span></a> *tz</code></em>,
                  <em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gint" title="gint ()"><span class="type">gint</span></a> year</code></em>,
                  <em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gint" title="gint ()"><span class="type">gint</span></a> month</code></em>,
                  <em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gint" title="gint ()"><span class="type">gint</span></a> day</code></em>,
                  <em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gint" title="gint ()"><span class="type">gint</span></a> hour</code></em>,
                  <em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gint" title="gint ()"><span class="type">gint</span></a> minute</code></em>,
                  <em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gdouble" title="gdouble"><span class="type">gdouble</span></a> seconds</code></em>);</pre>
 <p>Creates a new <a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="type">GDateTime</span></a> corresponding to the given date and time in
 the time zone <em class="parameter"><code>tz</code></em>
 .</p>
 <p>The <em class="parameter"><code>year</code></em>
  must be between 1 and 9999, <em class="parameter"><code>month</code></em>
  between 1 and 12 and <em class="parameter"><code>day</code></em>

 between 1 and 28, 29, 30 or 31 depending on the month and the year.</p>
 <p><em class="parameter"><code>hour</code></em>
  must be between 0 and 23 and <em class="parameter"><code>minute</code></em>
  must be between 0 and 59.</p>
 <p><em class="parameter"><code>seconds</code></em>
  must be at least 0.0 and must be strictly less than 60.0.
 It will be rounded down to the nearest microsecond.</p>
 <p>If the given time is not representable in the given time zone (for
 example, 02:30 on March 14th 2010 in Toronto, due to daylight savings
 time) then the time will be rounded up to the nearest existing time
 (in this case, 03:00).  If this matters to you then you should verify
 the return value for containing the same as the numbers you gave.</p>
 <p>In the case that the given time is ambiguous in the given time zone
 (for example, 01:30 on November 7th 2010 in Toronto, due to daylight
 savings time) then the time falling within standard (ie:
 non-daylight) time is taken.</p>
 <p>It not considered a programmer error for the values to this function
 to be out of range, but in the case that they are, the function will
 return <a class="link" href="glib-Standard-Macros.html#NULL:CAPS" title="NULL"><code class="literal">NULL</code></a>.</p>
 <p>You should release the return value by calling <a class="link" href="glib-GDateTime.html#g-date-time-unref" title="g_date_time_unref ()"><code class="function">g_date_time_unref()</code></a>
 when you are done with it.</p>
 <div class="refsect3">
 <a name="g-date-time-new.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>tz</p></td>
 <td class="parameter_description"><p>a <a class="link" href="glib-GTimeZone.html#GTimeZone" title="GTimeZone"><span class="type">GTimeZone</span></a></p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>year</p></td>
 <td class="parameter_description"><p>the year component of the date</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>month</p></td>
 <td class="parameter_description"><p>the month component of the date</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>day</p></td>
 <td class="parameter_description"><p>the day component of the date</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>hour</p></td>
 <td class="parameter_description"><p>the hour component of the date</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>minute</p></td>
 <td class="parameter_description"><p>the minute component of the date</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>seconds</p></td>
 <td class="parameter_description"><p>the number of seconds past the minute</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="g-date-time-new.returns"></a><h4>Returns</h4>
 <p> a new <a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="type">GDateTime</span></a>, or <a class="link" href="glib-Standard-Macros.html#NULL:CAPS" title="NULL"><code class="literal">NULL</code></a></p>
 </div>
 <p class="since">Since: <a class="link" href="api-index-2-26.html#api-index-2.26">2.26</a></p>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-date-time-new-local"></a><h3>g_date_time_new_local ()</h3>
 <pre class="programlisting"><a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="returnvalue">GDateTime</span></a> *
 g_date_time_new_local (<em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gint" title="gint ()"><span class="type">gint</span></a> year</code></em>,
                        <em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gint" title="gint ()"><span class="type">gint</span></a> month</code></em>,
                        <em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gint" title="gint ()"><span class="type">gint</span></a> day</code></em>,
                        <em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gint" title="gint ()"><span class="type">gint</span></a> hour</code></em>,
                        <em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gint" title="gint ()"><span class="type">gint</span></a> minute</code></em>,
                        <em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gdouble" title="gdouble"><span class="type">gdouble</span></a> seconds</code></em>);</pre>
 <p>Creates a new <a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="type">GDateTime</span></a> corresponding to the given date and time in
 the local time zone.</p>
 <p>This call is equivalent to calling <a class="link" href="glib-GDateTime.html#g-date-time-new" title="g_date_time_new ()"><code class="function">g_date_time_new()</code></a> with the time
 zone returned by <a class="link" href="glib-GTimeZone.html#g-time-zone-new-local" title="g_time_zone_new_local ()"><code class="function">g_time_zone_new_local()</code></a>.</p>
 <div class="refsect3">
 <a name="g-date-time-new-local.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>year</p></td>
 <td class="parameter_description"><p>the year component of the date</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>month</p></td>
 <td class="parameter_description"><p>the month component of the date</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>day</p></td>
 <td class="parameter_description"><p>the day component of the date</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>hour</p></td>
 <td class="parameter_description"><p>the hour component of the date</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>minute</p></td>
 <td class="parameter_description"><p>the minute component of the date</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>seconds</p></td>
 <td class="parameter_description"><p>the number of seconds past the minute</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="g-date-time-new-local.returns"></a><h4>Returns</h4>
 <p> a <a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="type">GDateTime</span></a>, or <a class="link" href="glib-Standard-Macros.html#NULL:CAPS" title="NULL"><code class="literal">NULL</code></a></p>
 </div>
 <p class="since">Since: <a class="link" href="api-index-2-26.html#api-index-2.26">2.26</a></p>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-date-time-new-utc"></a><h3>g_date_time_new_utc ()</h3>
 <pre class="programlisting"><a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="returnvalue">GDateTime</span></a> *
 g_date_time_new_utc (<em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gint" title="gint ()"><span class="type">gint</span></a> year</code></em>,
                      <em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gint" title="gint ()"><span class="type">gint</span></a> month</code></em>,
                      <em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gint" title="gint ()"><span class="type">gint</span></a> day</code></em>,
                      <em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gint" title="gint ()"><span class="type">gint</span></a> hour</code></em>,
                      <em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gint" title="gint ()"><span class="type">gint</span></a> minute</code></em>,
                      <em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gdouble" title="gdouble"><span class="type">gdouble</span></a> seconds</code></em>);</pre>
 <p>Creates a new <a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="type">GDateTime</span></a> corresponding to the given date and time in
 UTC.</p>
 <p>This call is equivalent to calling <a class="link" href="glib-GDateTime.html#g-date-time-new" title="g_date_time_new ()"><code class="function">g_date_time_new()</code></a> with the time
 zone returned by <a class="link" href="glib-GTimeZone.html#g-time-zone-new-utc" title="g_time_zone_new_utc ()"><code class="function">g_time_zone_new_utc()</code></a>.</p>
 <div class="refsect3">
 <a name="g-date-time-new-utc.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>year</p></td>
 <td class="parameter_description"><p>the year component of the date</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>month</p></td>
 <td class="parameter_description"><p>the month component of the date</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>day</p></td>
 <td class="parameter_description"><p>the day component of the date</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>hour</p></td>
 <td class="parameter_description"><p>the hour component of the date</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>minute</p></td>
 <td class="parameter_description"><p>the minute component of the date</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>seconds</p></td>
 <td class="parameter_description"><p>the number of seconds past the minute</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="g-date-time-new-utc.returns"></a><h4>Returns</h4>
 <p> a <a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="type">GDateTime</span></a>, or <a class="link" href="glib-Standard-Macros.html#NULL:CAPS" title="NULL"><code class="literal">NULL</code></a></p>
 </div>
 <p class="since">Since: <a class="link" href="api-index-2-26.html#api-index-2.26">2.26</a></p>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-date-time-add"></a><h3>g_date_time_add ()</h3>
 <pre class="programlisting"><a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="returnvalue">GDateTime</span></a> *
 g_date_time_add (<em class="parameter"><code><a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="type">GDateTime</span></a> *datetime</code></em>,
                  <em class="parameter"><code><a class="link" href="glib-GDateTime.html#GTimeSpan" title="GTimeSpan"><span class="type">GTimeSpan</span></a> timespan</code></em>);</pre>
 <p>Creates a copy of <em class="parameter"><code>datetime</code></em>
  and adds the specified timespan to the copy.</p>
 <div class="refsect3">
 <a name="g-date-time-add.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>datetime</p></td>
 <td class="parameter_description"><p>a <a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="type">GDateTime</span></a></p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>timespan</p></td>
 <td class="parameter_description"><p>a <a class="link" href="glib-GDateTime.html#GTimeSpan" title="GTimeSpan"><span class="type">GTimeSpan</span></a></p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="g-date-time-add.returns"></a><h4>Returns</h4>
 <p> the newly created <a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="type">GDateTime</span></a> which should be freed with
 <a class="link" href="glib-GDateTime.html#g-date-time-unref" title="g_date_time_unref ()"><code class="function">g_date_time_unref()</code></a>.</p>
 </div>
 <p class="since">Since: <a class="link" href="api-index-2-26.html#api-index-2.26">2.26</a></p>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-date-time-add-years"></a><h3>g_date_time_add_years ()</h3>
 <pre class="programlisting"><a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="returnvalue">GDateTime</span></a> *
 g_date_time_add_years (<em class="parameter"><code><a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="type">GDateTime</span></a> *datetime</code></em>,
                        <em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gint" title="gint ()"><span class="type">gint</span></a> years</code></em>);</pre>
 <p>Creates a copy of <em class="parameter"><code>datetime</code></em>
  and adds the specified number of years to the
 copy. Add negative values to subtract years.</p>
 <div class="refsect3">
 <a name="g-date-time-add-years.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>datetime</p></td>
 <td class="parameter_description"><p>a <a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="type">GDateTime</span></a></p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>years</p></td>
 <td class="parameter_description"><p>the number of years</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="g-date-time-add-years.returns"></a><h4>Returns</h4>
 <p> the newly created <a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="type">GDateTime</span></a> which should be freed with
 <a class="link" href="glib-GDateTime.html#g-date-time-unref" title="g_date_time_unref ()"><code class="function">g_date_time_unref()</code></a>.</p>
 </div>
 <p class="since">Since: <a class="link" href="api-index-2-26.html#api-index-2.26">2.26</a></p>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-date-time-add-months"></a><h3>g_date_time_add_months ()</h3>
 <pre class="programlisting"><a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="returnvalue">GDateTime</span></a> *
 g_date_time_add_months (<em class="parameter"><code><a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="type">GDateTime</span></a> *datetime</code></em>,
                         <em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gint" title="gint ()"><span class="type">gint</span></a> months</code></em>);</pre>
 <p>Creates a copy of <em class="parameter"><code>datetime</code></em>
  and adds the specified number of months to the
 copy. Add negative values to subtract months.</p>
 <div class="refsect3">
 <a name="g-date-time-add-months.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>datetime</p></td>
 <td class="parameter_description"><p>a <a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="type">GDateTime</span></a></p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>months</p></td>
 <td class="parameter_description"><p>the number of months</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="g-date-time-add-months.returns"></a><h4>Returns</h4>
 <p> the newly created <a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="type">GDateTime</span></a> which should be freed with
 <a class="link" href="glib-GDateTime.html#g-date-time-unref" title="g_date_time_unref ()"><code class="function">g_date_time_unref()</code></a>.</p>
 </div>
 <p class="since">Since: <a class="link" href="api-index-2-26.html#api-index-2.26">2.26</a></p>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-date-time-add-weeks"></a><h3>g_date_time_add_weeks ()</h3>
 <pre class="programlisting"><a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="returnvalue">GDateTime</span></a> *
 g_date_time_add_weeks (<em class="parameter"><code><a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="type">GDateTime</span></a> *datetime</code></em>,
                        <em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gint" title="gint ()"><span class="type">gint</span></a> weeks</code></em>);</pre>
 <p>Creates a copy of <em class="parameter"><code>datetime</code></em>
  and adds the specified number of weeks to the
 copy. Add negative values to subtract weeks.</p>
 <div class="refsect3">
 <a name="g-date-time-add-weeks.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>datetime</p></td>
 <td class="parameter_description"><p>a <a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="type">GDateTime</span></a></p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>weeks</p></td>
 <td class="parameter_description"><p>the number of weeks</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="g-date-time-add-weeks.returns"></a><h4>Returns</h4>
 <p> the newly created <a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="type">GDateTime</span></a> which should be freed with
 <a class="link" href="glib-GDateTime.html#g-date-time-unref" title="g_date_time_unref ()"><code class="function">g_date_time_unref()</code></a>.</p>
 </div>
 <p class="since">Since: <a class="link" href="api-index-2-26.html#api-index-2.26">2.26</a></p>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-date-time-add-days"></a><h3>g_date_time_add_days ()</h3>
 <pre class="programlisting"><a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="returnvalue">GDateTime</span></a> *
 g_date_time_add_days (<em class="parameter"><code><a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="type">GDateTime</span></a> *datetime</code></em>,
                       <em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gint" title="gint ()"><span class="type">gint</span></a> days</code></em>);</pre>
 <p>Creates a copy of <em class="parameter"><code>datetime</code></em>
  and adds the specified number of days to the
 copy. Add negative values to subtract days.</p>
 <div class="refsect3">
 <a name="g-date-time-add-days.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>datetime</p></td>
 <td class="parameter_description"><p>a <a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="type">GDateTime</span></a></p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>days</p></td>
 <td class="parameter_description"><p>the number of days</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="g-date-time-add-days.returns"></a><h4>Returns</h4>
 <p> the newly created <a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="type">GDateTime</span></a> which should be freed with
 <a class="link" href="glib-GDateTime.html#g-date-time-unref" title="g_date_time_unref ()"><code class="function">g_date_time_unref()</code></a>.</p>
 </div>
 <p class="since">Since: <a class="link" href="api-index-2-26.html#api-index-2.26">2.26</a></p>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-date-time-add-hours"></a><h3>g_date_time_add_hours ()</h3>
 <pre class="programlisting"><a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="returnvalue">GDateTime</span></a> *
 g_date_time_add_hours (<em class="parameter"><code><a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="type">GDateTime</span></a> *datetime</code></em>,
                        <em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gint" title="gint ()"><span class="type">gint</span></a> hours</code></em>);</pre>
 <p>Creates a copy of <em class="parameter"><code>datetime</code></em>
  and adds the specified number of hours.
 Add negative values to subtract hours.</p>
 <div class="refsect3">
 <a name="g-date-time-add-hours.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>datetime</p></td>
 <td class="parameter_description"><p>a <a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="type">GDateTime</span></a></p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>hours</p></td>
 <td class="parameter_description"><p>the number of hours to add</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="g-date-time-add-hours.returns"></a><h4>Returns</h4>
 <p> the newly created <a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="type">GDateTime</span></a> which should be freed with
 <a class="link" href="glib-GDateTime.html#g-date-time-unref" title="g_date_time_unref ()"><code class="function">g_date_time_unref()</code></a>.</p>
 </div>
 <p class="since">Since: <a class="link" href="api-index-2-26.html#api-index-2.26">2.26</a></p>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-date-time-add-minutes"></a><h3>g_date_time_add_minutes ()</h3>
 <pre class="programlisting"><a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="returnvalue">GDateTime</span></a> *
 g_date_time_add_minutes (<em class="parameter"><code><a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="type">GDateTime</span></a> *datetime</code></em>,
                          <em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gint" title="gint ()"><span class="type">gint</span></a> minutes</code></em>);</pre>
 <p>Creates a copy of <em class="parameter"><code>datetime</code></em>
  adding the specified number of minutes.
 Add negative values to subtract minutes.</p>
 <div class="refsect3">
 <a name="g-date-time-add-minutes.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>datetime</p></td>
 <td class="parameter_description"><p>a <a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="type">GDateTime</span></a></p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>minutes</p></td>
 <td class="parameter_description"><p>the number of minutes to add</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="g-date-time-add-minutes.returns"></a><h4>Returns</h4>
 <p> the newly created <a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="type">GDateTime</span></a> which should be freed with
 <a class="link" href="glib-GDateTime.html#g-date-time-unref" title="g_date_time_unref ()"><code class="function">g_date_time_unref()</code></a>.</p>
 </div>
 <p class="since">Since: <a class="link" href="api-index-2-26.html#api-index-2.26">2.26</a></p>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-date-time-add-seconds"></a><h3>g_date_time_add_seconds ()</h3>
 <pre class="programlisting"><a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="returnvalue">GDateTime</span></a> *
 g_date_time_add_seconds (<em class="parameter"><code><a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="type">GDateTime</span></a> *datetime</code></em>,
                          <em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gdouble" title="gdouble"><span class="type">gdouble</span></a> seconds</code></em>);</pre>
 <p>Creates a copy of <em class="parameter"><code>datetime</code></em>
  and adds the specified number of seconds.
 Add negative values to subtract seconds.</p>
 <div class="refsect3">
 <a name="g-date-time-add-seconds.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>datetime</p></td>
 <td class="parameter_description"><p>a <a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="type">GDateTime</span></a></p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>seconds</p></td>
 <td class="parameter_description"><p>the number of seconds to add</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="g-date-time-add-seconds.returns"></a><h4>Returns</h4>
 <p> the newly created <a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="type">GDateTime</span></a> which should be freed with
 <a class="link" href="glib-GDateTime.html#g-date-time-unref" title="g_date_time_unref ()"><code class="function">g_date_time_unref()</code></a>.</p>
 </div>
 <p class="since">Since: <a class="link" href="api-index-2-26.html#api-index-2.26">2.26</a></p>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-date-time-add-full"></a><h3>g_date_time_add_full ()</h3>
 <pre class="programlisting"><a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="returnvalue">GDateTime</span></a> *
 g_date_time_add_full (<em class="parameter"><code><a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="type">GDateTime</span></a> *datetime</code></em>,
                       <em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gint" title="gint ()"><span class="type">gint</span></a> years</code></em>,
                       <em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gint" title="gint ()"><span class="type">gint</span></a> months</code></em>,
                       <em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gint" title="gint ()"><span class="type">gint</span></a> days</code></em>,
                       <em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gint" title="gint ()"><span class="type">gint</span></a> hours</code></em>,
                       <em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gint" title="gint ()"><span class="type">gint</span></a> minutes</code></em>,
                       <em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gdouble" title="gdouble"><span class="type">gdouble</span></a> seconds</code></em>);</pre>
 <p>Creates a new <a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="type">GDateTime</span></a> adding the specified values to the current date and
 time in <em class="parameter"><code>datetime</code></em>
 . Add negative values to subtract.</p>
 <div class="refsect3">
 <a name="g-date-time-add-full.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>datetime</p></td>
 <td class="parameter_description"><p>a <a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="type">GDateTime</span></a></p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>years</p></td>
 <td class="parameter_description"><p>the number of years to add</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>months</p></td>
 <td class="parameter_description"><p>the number of months to add</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>days</p></td>
 <td class="parameter_description"><p>the number of days to add</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>hours</p></td>
 <td class="parameter_description"><p>the number of hours to add</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>minutes</p></td>
 <td class="parameter_description"><p>the number of minutes to add</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>seconds</p></td>
 <td class="parameter_description"><p>the number of seconds to add</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="g-date-time-add-full.returns"></a><h4>Returns</h4>
 <p> the newly created <a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="type">GDateTime</span></a> that should be freed with
 <a class="link" href="glib-GDateTime.html#g-date-time-unref" title="g_date_time_unref ()"><code class="function">g_date_time_unref()</code></a>.</p>
 </div>
 <p class="since">Since: <a class="link" href="api-index-2-26.html#api-index-2.26">2.26</a></p>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-date-time-compare"></a><h3>g_date_time_compare ()</h3>
 <pre class="programlisting"><a class="link" href="glib-Basic-Types.html#gint" title="gint ()"><span class="returnvalue">gint</span></a>
 g_date_time_compare (<em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gconstpointer" title="gconstpointer"><span class="type">gconstpointer</span></a> dt1</code></em>,
                      <em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gconstpointer" title="gconstpointer"><span class="type">gconstpointer</span></a> dt2</code></em>);</pre>
 <p>A comparison function for <a href="glib-GDateTime.html#GDateTime"><span class="type">GDateTimes</span></a> that is suitable
 as a <a class="link" href="glib-Doubly-Linked-Lists.html#GCompareFunc" title="GCompareFunc ()"><span class="type">GCompareFunc</span></a>. Both <a href="glib-GDateTime.html#GDateTime"><span class="type">GDateTimes</span></a> must be non-<a class="link" href="glib-Standard-Macros.html#NULL:CAPS" title="NULL"><code class="literal">NULL</code></a>.</p>
 <div class="refsect3">
 <a name="g-date-time-compare.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>dt1</p></td>
 <td class="parameter_description"><p> first <a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="type">GDateTime</span></a> to compare. </p></td>
 <td class="parameter_annotations"><span class="annotation">[<acronym title="NULL must not be passed as the value in, out, in-out; or as a return value."><span class="acronym">not nullable</span></acronym>]</span></td>
 </tr>
 <tr>
 <td class="parameter_name"><p>dt2</p></td>
 <td class="parameter_description"><p> second <a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="type">GDateTime</span></a> to compare. </p></td>
 <td class="parameter_annotations"><span class="annotation">[<acronym title="NULL must not be passed as the value in, out, in-out; or as a return value."><span class="acronym">not nullable</span></acronym>]</span></td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="g-date-time-compare.returns"></a><h4>Returns</h4>
 <p> -1, 0 or 1 if <em class="parameter"><code>dt1</code></em>
 is less than, equal to or greater
 than <em class="parameter"><code>dt2</code></em>
 .</p>
 </div>
 <p class="since">Since: <a class="link" href="api-index-2-26.html#api-index-2.26">2.26</a></p>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-date-time-difference"></a><h3>g_date_time_difference ()</h3>
 <pre class="programlisting"><a class="link" href="glib-GDateTime.html#GTimeSpan" title="GTimeSpan"><span class="returnvalue">GTimeSpan</span></a>
 g_date_time_difference (<em class="parameter"><code><a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="type">GDateTime</span></a> *end</code></em>,
                         <em class="parameter"><code><a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="type">GDateTime</span></a> *begin</code></em>);</pre>
 <p>Calculates the difference in time between <em class="parameter"><code>end</code></em>
  and <em class="parameter"><code>begin</code></em>
 .  The
 <a class="link" href="glib-GDateTime.html#GTimeSpan" title="GTimeSpan"><span class="type">GTimeSpan</span></a> that is returned is effectively <em class="parameter"><code>end</code></em>
  - <em class="parameter"><code>begin</code></em>
  (ie:
 positive if the first parameter is larger).</p>
 <div class="refsect3">
 <a name="g-date-time-difference.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>end</p></td>
 <td class="parameter_description"><p>a <a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="type">GDateTime</span></a></p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>begin</p></td>
 <td class="parameter_description"><p>a <a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="type">GDateTime</span></a></p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="g-date-time-difference.returns"></a><h4>Returns</h4>
 <p> the difference between the two <a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="type">GDateTime</span></a>, as a time
 span expressed in microseconds.</p>
 </div>
 <p class="since">Since: <a class="link" href="api-index-2-26.html#api-index-2.26">2.26</a></p>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-date-time-hash"></a><h3>g_date_time_hash ()</h3>
 <pre class="programlisting"><a class="link" href="glib-Basic-Types.html#guint" title="guint ()"><span class="returnvalue">guint</span></a>
 g_date_time_hash (<em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gconstpointer" title="gconstpointer"><span class="type">gconstpointer</span></a> datetime</code></em>);</pre>
 <p>Hashes <em class="parameter"><code>datetime</code></em>
  into a <a class="link" href="glib-Basic-Types.html#guint" title="guint ()"><span class="type">guint</span></a>, suitable for use within <a class="link" href="glib-Hash-Tables.html#GHashTable" title="GHashTable"><span class="type">GHashTable</span></a>.</p>
 <div class="refsect3">
 <a name="g-date-time-hash.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody><tr>
 <td class="parameter_name"><p>datetime</p></td>
 <td class="parameter_description"><p> a <a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="type">GDateTime</span></a>. </p></td>
 <td class="parameter_annotations"><span class="annotation">[<acronym title="NULL must not be passed as the value in, out, in-out; or as a return value."><span class="acronym">not nullable</span></acronym>]</span></td>
 </tr></tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="g-date-time-hash.returns"></a><h4>Returns</h4>
 <p> a <a class="link" href="glib-Basic-Types.html#guint" title="guint ()"><span class="type">guint</span></a> containing the hash</p>
 </div>
 <p class="since">Since: <a class="link" href="api-index-2-26.html#api-index-2.26">2.26</a></p>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-date-time-equal"></a><h3>g_date_time_equal ()</h3>
 <pre class="programlisting"><a class="link" href="glib-Basic-Types.html#gboolean" title="gboolean"><span class="returnvalue">gboolean</span></a>
 g_date_time_equal (<em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gconstpointer" title="gconstpointer"><span class="type">gconstpointer</span></a> dt1</code></em>,
                    <em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gconstpointer" title="gconstpointer"><span class="type">gconstpointer</span></a> dt2</code></em>);</pre>
 <p>Checks to see if <em class="parameter"><code>dt1</code></em>
  and <em class="parameter"><code>dt2</code></em>
  are equal.</p>
 <p>Equal here means that they represent the same moment after converting
 them to the same time zone.</p>
 <div class="refsect3">
 <a name="g-date-time-equal.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>dt1</p></td>
 <td class="parameter_description"><p> a <a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="type">GDateTime</span></a>. </p></td>
 <td class="parameter_annotations"><span class="annotation">[<acronym title="NULL must not be passed as the value in, out, in-out; or as a return value."><span class="acronym">not nullable</span></acronym>]</span></td>
 </tr>
 <tr>
 <td class="parameter_name"><p>dt2</p></td>
 <td class="parameter_description"><p> a <a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="type">GDateTime</span></a>. </p></td>
 <td class="parameter_annotations"><span class="annotation">[<acronym title="NULL must not be passed as the value in, out, in-out; or as a return value."><span class="acronym">not nullable</span></acronym>]</span></td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="g-date-time-equal.returns"></a><h4>Returns</h4>
 <p> <a class="link" href="glib-Standard-Macros.html#TRUE:CAPS" title="TRUE"><code class="literal">TRUE</code></a> if <em class="parameter"><code>dt1</code></em>
 and <em class="parameter"><code>dt2</code></em>
 are equal</p>
 </div>
 <p class="since">Since: <a class="link" href="api-index-2-26.html#api-index-2.26">2.26</a></p>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-date-time-get-ymd"></a><h3>g_date_time_get_ymd ()</h3>
 <pre class="programlisting"><span class="returnvalue">void</span>
 g_date_time_get_ymd (<em class="parameter"><code><a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="type">GDateTime</span></a> *datetime</code></em>,
                      <em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gint" title="gint ()"><span class="type">gint</span></a> *year</code></em>,
                      <em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gint" title="gint ()"><span class="type">gint</span></a> *month</code></em>,
                      <em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gint" title="gint ()"><span class="type">gint</span></a> *day</code></em>);</pre>
 <p>Retrieves the Gregorian day, month, and year of a given <a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="type">GDateTime</span></a>.</p>
 <div class="refsect3">
 <a name="g-date-time-get-ymd.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>datetime</p></td>
 <td class="parameter_description"><p>a <a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="type">GDateTime</span></a>.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>year</p></td>
 <td class="parameter_description"><p> the return location for the gregorian year, or <a class="link" href="glib-Standard-Macros.html#NULL:CAPS" title="NULL"><code class="literal">NULL</code></a>. </p></td>
 <td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>][<acronym title="NULL is OK, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span></td>
 </tr>
 <tr>
 <td class="parameter_name"><p>month</p></td>
 <td class="parameter_description"><p> the return location for the month of the year, or <a class="link" href="glib-Standard-Macros.html#NULL:CAPS" title="NULL"><code class="literal">NULL</code></a>. </p></td>
 <td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>][<acronym title="NULL is OK, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span></td>
 </tr>
 <tr>
 <td class="parameter_name"><p>day</p></td>
 <td class="parameter_description"><p> the return location for the day of the month, or <a class="link" href="glib-Standard-Macros.html#NULL:CAPS" title="NULL"><code class="literal">NULL</code></a>. </p></td>
 <td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>][<acronym title="NULL is OK, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span></td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <p class="since">Since: <a class="link" href="api-index-2-26.html#api-index-2.26">2.26</a></p>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-date-time-get-year"></a><h3>g_date_time_get_year ()</h3>
 <pre class="programlisting"><a class="link" href="glib-Basic-Types.html#gint" title="gint ()"><span class="returnvalue">gint</span></a>
 g_date_time_get_year (<em class="parameter"><code><a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="type">GDateTime</span></a> *datetime</code></em>);</pre>
 <p>Retrieves the year represented by <em class="parameter"><code>datetime</code></em>
  in the Gregorian calendar.</p>
 <div class="refsect3">
 <a name="g-date-time-get-year.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody><tr>
 <td class="parameter_name"><p>datetime</p></td>
 <td class="parameter_description"><p>A <a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="type">GDateTime</span></a></p></td>
 <td class="parameter_annotations"> </td>
 </tr></tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="g-date-time-get-year.returns"></a><h4>Returns</h4>
 <p> the year represented by <em class="parameter"><code>datetime</code></em>
 </p>
 </div>
 <p class="since">Since: <a class="link" href="api-index-2-26.html#api-index-2.26">2.26</a></p>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-date-time-get-month"></a><h3>g_date_time_get_month ()</h3>
 <pre class="programlisting"><a class="link" href="glib-Basic-Types.html#gint" title="gint ()"><span class="returnvalue">gint</span></a>
 g_date_time_get_month (<em class="parameter"><code><a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="type">GDateTime</span></a> *datetime</code></em>);</pre>
 <p>Retrieves the month of the year represented by <em class="parameter"><code>datetime</code></em>
  in the Gregorian
 calendar.</p>
 <div class="refsect3">
 <a name="g-date-time-get-month.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody><tr>
 <td class="parameter_name"><p>datetime</p></td>
 <td class="parameter_description"><p>a <a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="type">GDateTime</span></a></p></td>
 <td class="parameter_annotations"> </td>
 </tr></tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="g-date-time-get-month.returns"></a><h4>Returns</h4>
 <p> the month represented by <em class="parameter"><code>datetime</code></em>
 </p>
 </div>
 <p class="since">Since: <a class="link" href="api-index-2-26.html#api-index-2.26">2.26</a></p>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-date-time-get-day-of-month"></a><h3>g_date_time_get_day_of_month ()</h3>
 <pre class="programlisting"><a class="link" href="glib-Basic-Types.html#gint" title="gint ()"><span class="returnvalue">gint</span></a>
 g_date_time_get_day_of_month (<em class="parameter"><code><a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="type">GDateTime</span></a> *datetime</code></em>);</pre>
 <p>Retrieves the day of the month represented by <em class="parameter"><code>datetime</code></em>
  in the gregorian
 calendar.</p>
 <div class="refsect3">
 <a name="g-date-time-get-day-of-month.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody><tr>
 <td class="parameter_name"><p>datetime</p></td>
 <td class="parameter_description"><p>a <a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="type">GDateTime</span></a></p></td>
 <td class="parameter_annotations"> </td>
 </tr></tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="g-date-time-get-day-of-month.returns"></a><h4>Returns</h4>
 <p> the day of the month</p>
 </div>
 <p class="since">Since: <a class="link" href="api-index-2-26.html#api-index-2.26">2.26</a></p>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-date-time-get-week-numbering-year"></a><h3>g_date_time_get_week_numbering_year ()</h3>
 <pre class="programlisting"><a class="link" href="glib-Basic-Types.html#gint" title="gint ()"><span class="returnvalue">gint</span></a>
 g_date_time_get_week_numbering_year (<em class="parameter"><code><a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="type">GDateTime</span></a> *datetime</code></em>);</pre>
 <p>Returns the ISO 8601 week-numbering year in which the week containing
 <em class="parameter"><code>datetime</code></em>
  falls.</p>
 <p>This function, taken together with <a class="link" href="glib-GDateTime.html#g-date-time-get-week-of-year" title="g_date_time_get_week_of_year ()"><code class="function">g_date_time_get_week_of_year()</code></a> and
 <a class="link" href="glib-GDateTime.html#g-date-time-get-day-of-week" title="g_date_time_get_day_of_week ()"><code class="function">g_date_time_get_day_of_week()</code></a> can be used to determine the full ISO
 week date on which <em class="parameter"><code>datetime</code></em>
  falls.</p>
 <p>This is usually equal to the normal Gregorian year (as returned by
 <a class="link" href="glib-GDateTime.html#g-date-time-get-year" title="g_date_time_get_year ()"><code class="function">g_date_time_get_year()</code></a>), except as detailed below:</p>
 <p>For Thursday, the week-numbering year is always equal to the usual
 calendar year.  For other days, the number is such that every day
 within a complete week (Monday to Sunday) is contained within the
 same week-numbering year.</p>
 <p>For Monday, Tuesday and Wednesday occurring near the end of the year,
 this may mean that the week-numbering year is one greater than the
 calendar year (so that these days have the same week-numbering year
 as the Thursday occurring early in the next year).</p>
 <p>For Friday, Saturday and Sunday occurring near the start of the year,
 this may mean that the week-numbering year is one less than the
 calendar year (so that these days have the same week-numbering year
 as the Thursday occurring late in the previous year).</p>
 <p>An equivalent description is that the week-numbering year is equal to
 the calendar year containing the majority of the days in the current
 week (Monday to Sunday).</p>
 <p>Note that January 1 0001 in the proleptic Gregorian calendar is a
 Monday, so this function never returns 0.</p>
 <div class="refsect3">
 <a name="g-date-time-get-week-numbering-year.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody><tr>
 <td class="parameter_name"><p>datetime</p></td>
 <td class="parameter_description"><p>a <a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="type">GDateTime</span></a></p></td>
 <td class="parameter_annotations"> </td>
 </tr></tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="g-date-time-get-week-numbering-year.returns"></a><h4>Returns</h4>
 <p> the ISO 8601 week-numbering year for <em class="parameter"><code>datetime</code></em>
 </p>
 </div>
 <p class="since">Since: <a class="link" href="api-index-2-26.html#api-index-2.26">2.26</a></p>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-date-time-get-week-of-year"></a><h3>g_date_time_get_week_of_year ()</h3>
 <pre class="programlisting"><a class="link" href="glib-Basic-Types.html#gint" title="gint ()"><span class="returnvalue">gint</span></a>
 g_date_time_get_week_of_year (<em class="parameter"><code><a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="type">GDateTime</span></a> *datetime</code></em>);</pre>
 <p>Returns the ISO 8601 week number for the week containing <em class="parameter"><code>datetime</code></em>
 .
 The ISO 8601 week number is the same for every day of the week (from
 Moday through Sunday).  That can produce some unusual results
 (described below).</p>
 <p>The first week of the year is week 1.  This is the week that contains
 the first Thursday of the year.  Equivalently, this is the first week
 that has more than 4 of its days falling within the calendar year.</p>
 <p>The value 0 is never returned by this function.  Days contained
 within a year but occurring before the first ISO 8601 week of that
 year are considered as being contained in the last week of the
 previous year.  Similarly, the final days of a calendar year may be
 considered as being part of the first ISO 8601 week of the next year
 if 4 or more days of that week are contained within the new year.</p>
 <div class="refsect3">
 <a name="g-date-time-get-week-of-year.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody><tr>
 <td class="parameter_name"><p>datetime</p></td>
 <td class="parameter_description"><p>a <a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="type">GDateTime</span></a></p></td>
 <td class="parameter_annotations"> </td>
 </tr></tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="g-date-time-get-week-of-year.returns"></a><h4>Returns</h4>
 <p> the ISO 8601 week number for <em class="parameter"><code>datetime</code></em>
 .</p>
 </div>
 <p class="since">Since: <a class="link" href="api-index-2-26.html#api-index-2.26">2.26</a></p>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-date-time-get-day-of-week"></a><h3>g_date_time_get_day_of_week ()</h3>
 <pre class="programlisting"><a class="link" href="glib-Basic-Types.html#gint" title="gint ()"><span class="returnvalue">gint</span></a>
 g_date_time_get_day_of_week (<em class="parameter"><code><a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="type">GDateTime</span></a> *datetime</code></em>);</pre>
 <p>Retrieves the ISO 8601 day of the week on which <em class="parameter"><code>datetime</code></em>
  falls (1 is
 Monday, 2 is Tuesday... 7 is Sunday).</p>
 <div class="refsect3">
 <a name="g-date-time-get-day-of-week.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody><tr>
 <td class="parameter_name"><p>datetime</p></td>
 <td class="parameter_description"><p>a <a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="type">GDateTime</span></a></p></td>
 <td class="parameter_annotations"> </td>
 </tr></tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="g-date-time-get-day-of-week.returns"></a><h4>Returns</h4>
 <p> the day of the week</p>
 </div>
 <p class="since">Since: <a class="link" href="api-index-2-26.html#api-index-2.26">2.26</a></p>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-date-time-get-day-of-year"></a><h3>g_date_time_get_day_of_year ()</h3>
 <pre class="programlisting"><a class="link" href="glib-Basic-Types.html#gint" title="gint ()"><span class="returnvalue">gint</span></a>
 g_date_time_get_day_of_year (<em class="parameter"><code><a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="type">GDateTime</span></a> *datetime</code></em>);</pre>
 <p>Retrieves the day of the year represented by <em class="parameter"><code>datetime</code></em>
  in the Gregorian
 calendar.</p>
 <div class="refsect3">
 <a name="g-date-time-get-day-of-year.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody><tr>
 <td class="parameter_name"><p>datetime</p></td>
 <td class="parameter_description"><p>a <a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="type">GDateTime</span></a></p></td>
 <td class="parameter_annotations"> </td>
 </tr></tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="g-date-time-get-day-of-year.returns"></a><h4>Returns</h4>
 <p> the day of the year</p>
 </div>
 <p class="since">Since: <a class="link" href="api-index-2-26.html#api-index-2.26">2.26</a></p>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-date-time-get-hour"></a><h3>g_date_time_get_hour ()</h3>
 <pre class="programlisting"><a class="link" href="glib-Basic-Types.html#gint" title="gint ()"><span class="returnvalue">gint</span></a>
 g_date_time_get_hour (<em class="parameter"><code><a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="type">GDateTime</span></a> *datetime</code></em>);</pre>
 <p>Retrieves the hour of the day represented by <em class="parameter"><code>datetime</code></em>
 </p>
 <div class="refsect3">
 <a name="g-date-time-get-hour.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody><tr>
 <td class="parameter_name"><p>datetime</p></td>
 <td class="parameter_description"><p>a <a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="type">GDateTime</span></a></p></td>
 <td class="parameter_annotations"> </td>
 </tr></tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="g-date-time-get-hour.returns"></a><h4>Returns</h4>
 <p> the hour of the day</p>
 </div>
 <p class="since">Since: <a class="link" href="api-index-2-26.html#api-index-2.26">2.26</a></p>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-date-time-get-minute"></a><h3>g_date_time_get_minute ()</h3>
 <pre class="programlisting"><a class="link" href="glib-Basic-Types.html#gint" title="gint ()"><span class="returnvalue">gint</span></a>
 g_date_time_get_minute (<em class="parameter"><code><a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="type">GDateTime</span></a> *datetime</code></em>);</pre>
 <p>Retrieves the minute of the hour represented by <em class="parameter"><code>datetime</code></em>
 </p>
 <div class="refsect3">
 <a name="g-date-time-get-minute.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody><tr>
 <td class="parameter_name"><p>datetime</p></td>
 <td class="parameter_description"><p>a <a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="type">GDateTime</span></a></p></td>
 <td class="parameter_annotations"> </td>
 </tr></tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="g-date-time-get-minute.returns"></a><h4>Returns</h4>
 <p> the minute of the hour</p>
 </div>
 <p class="since">Since: <a class="link" href="api-index-2-26.html#api-index-2.26">2.26</a></p>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-date-time-get-second"></a><h3>g_date_time_get_second ()</h3>
 <pre class="programlisting"><a class="link" href="glib-Basic-Types.html#gint" title="gint ()"><span class="returnvalue">gint</span></a>
 g_date_time_get_second (<em class="parameter"><code><a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="type">GDateTime</span></a> *datetime</code></em>);</pre>
 <p>Retrieves the second of the minute represented by <em class="parameter"><code>datetime</code></em>
 </p>
 <div class="refsect3">
 <a name="g-date-time-get-second.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody><tr>
 <td class="parameter_name"><p>datetime</p></td>
 <td class="parameter_description"><p>a <a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="type">GDateTime</span></a></p></td>
 <td class="parameter_annotations"> </td>
 </tr></tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="g-date-time-get-second.returns"></a><h4>Returns</h4>
 <p> the second represented by <em class="parameter"><code>datetime</code></em>
 </p>
 </div>
 <p class="since">Since: <a class="link" href="api-index-2-26.html#api-index-2.26">2.26</a></p>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-date-time-get-microsecond"></a><h3>g_date_time_get_microsecond ()</h3>
 <pre class="programlisting"><a class="link" href="glib-Basic-Types.html#gint" title="gint ()"><span class="returnvalue">gint</span></a>
 g_date_time_get_microsecond (<em class="parameter"><code><a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="type">GDateTime</span></a> *datetime</code></em>);</pre>
 <p>Retrieves the microsecond of the date represented by <em class="parameter"><code>datetime</code></em>
 </p>
 <div class="refsect3">
 <a name="g-date-time-get-microsecond.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody><tr>
 <td class="parameter_name"><p>datetime</p></td>
 <td class="parameter_description"><p>a <a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="type">GDateTime</span></a></p></td>
 <td class="parameter_annotations"> </td>
 </tr></tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="g-date-time-get-microsecond.returns"></a><h4>Returns</h4>
 <p> the microsecond of the second</p>
 </div>
 <p class="since">Since: <a class="link" href="api-index-2-26.html#api-index-2.26">2.26</a></p>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-date-time-get-seconds"></a><h3>g_date_time_get_seconds ()</h3>
 <pre class="programlisting"><a class="link" href="glib-Basic-Types.html#gdouble" title="gdouble"><span class="returnvalue">gdouble</span></a>
 g_date_time_get_seconds (<em class="parameter"><code><a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="type">GDateTime</span></a> *datetime</code></em>);</pre>
 <p>Retrieves the number of seconds since the start of the last minute,
 including the fractional part.</p>
 <div class="refsect3">
 <a name="g-date-time-get-seconds.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody><tr>
 <td class="parameter_name"><p>datetime</p></td>
 <td class="parameter_description"><p>a <a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="type">GDateTime</span></a></p></td>
 <td class="parameter_annotations"> </td>
 </tr></tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="g-date-time-get-seconds.returns"></a><h4>Returns</h4>
 <p> the number of seconds</p>
 </div>
 <p class="since">Since: <a class="link" href="api-index-2-26.html#api-index-2.26">2.26</a></p>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-date-time-to-unix"></a><h3>g_date_time_to_unix ()</h3>
 <pre class="programlisting"><a class="link" href="glib-Basic-Types.html#gint64" title="gint64"><span class="returnvalue">gint64</span></a>
 g_date_time_to_unix (<em class="parameter"><code><a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="type">GDateTime</span></a> *datetime</code></em>);</pre>
 <p>Gives the Unix time corresponding to <em class="parameter"><code>datetime</code></em>
 , rounding down to the
 nearest second.</p>
 <p>Unix time is the number of seconds that have elapsed since 1970-01-01
 00:00:00 UTC, regardless of the time zone associated with <em class="parameter"><code>datetime</code></em>
 .</p>
 <div class="refsect3">
 <a name="g-date-time-to-unix.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody><tr>
 <td class="parameter_name"><p>datetime</p></td>
 <td class="parameter_description"><p>a <a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="type">GDateTime</span></a></p></td>
 <td class="parameter_annotations"> </td>
 </tr></tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="g-date-time-to-unix.returns"></a><h4>Returns</h4>
 <p> the Unix time corresponding to <em class="parameter"><code>datetime</code></em>
 </p>
 </div>
 <p class="since">Since: <a class="link" href="api-index-2-26.html#api-index-2.26">2.26</a></p>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-date-time-to-timeval"></a><h3>g_date_time_to_timeval ()</h3>
 <pre class="programlisting"><a class="link" href="glib-Basic-Types.html#gboolean" title="gboolean"><span class="returnvalue">gboolean</span></a>
 g_date_time_to_timeval (<em class="parameter"><code><a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="type">GDateTime</span></a> *datetime</code></em>,
                         <em class="parameter"><code><a class="link" href="glib-Date-and-Time-Functions.html#GTimeVal" title="struct GTimeVal"><span class="type">GTimeVal</span></a> *tv</code></em>);</pre>
 <p>Stores the instant in time that <em class="parameter"><code>datetime</code></em>
  represents into <em class="parameter"><code>tv</code></em>
 .</p>
 <p>The time contained in a <a class="link" href="glib-Date-and-Time-Functions.html#GTimeVal" title="struct GTimeVal"><span class="type">GTimeVal</span></a> is always stored in the form of
 seconds elapsed since 1970-01-01 00:00:00 UTC, regardless of the time
 zone associated with <em class="parameter"><code>datetime</code></em>
 .</p>
 <p>On systems where 'long' is 32bit (ie: all 32bit systems and all
 Windows systems), a <a class="link" href="glib-Date-and-Time-Functions.html#GTimeVal" title="struct GTimeVal"><span class="type">GTimeVal</span></a> is incapable of storing the entire
 range of values that <a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="type">GDateTime</span></a> is capable of expressing.  On those
 systems, this function returns <a class="link" href="glib-Standard-Macros.html#FALSE:CAPS" title="FALSE"><code class="literal">FALSE</code></a> to indicate that the time is
 out of range.</p>
 <p>On systems where 'long' is 64bit, this function never fails.</p>
 <div class="refsect3">
 <a name="g-date-time-to-timeval.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>datetime</p></td>
 <td class="parameter_description"><p>a <a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="type">GDateTime</span></a></p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>tv</p></td>
 <td class="parameter_description"><p>a <a class="link" href="glib-Date-and-Time-Functions.html#GTimeVal" title="struct GTimeVal"><span class="type">GTimeVal</span></a> to modify</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="g-date-time-to-timeval.returns"></a><h4>Returns</h4>
 <p> <a class="link" href="glib-Standard-Macros.html#TRUE:CAPS" title="TRUE"><code class="literal">TRUE</code></a> if successful, else <a class="link" href="glib-Standard-Macros.html#FALSE:CAPS" title="FALSE"><code class="literal">FALSE</code></a></p>
 </div>
 <p class="since">Since: <a class="link" href="api-index-2-26.html#api-index-2.26">2.26</a></p>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-date-time-get-utc-offset"></a><h3>g_date_time_get_utc_offset ()</h3>
 <pre class="programlisting"><a class="link" href="glib-GDateTime.html#GTimeSpan" title="GTimeSpan"><span class="returnvalue">GTimeSpan</span></a>
 g_date_time_get_utc_offset (<em class="parameter"><code><a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="type">GDateTime</span></a> *datetime</code></em>);</pre>
 <p>Determines the offset to UTC in effect at the time and in the time
 zone of <em class="parameter"><code>datetime</code></em>
 .</p>
 <p>The offset is the number of microseconds that you add to UTC time to
 arrive at local time for the time zone (ie: negative numbers for time
 zones west of GMT, positive numbers for east).</p>
 <p>If <em class="parameter"><code>datetime</code></em>
  represents UTC time, then the offset is always zero.</p>
 <div class="refsect3">
 <a name="g-date-time-get-utc-offset.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody><tr>
 <td class="parameter_name"><p>datetime</p></td>
 <td class="parameter_description"><p>a <a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="type">GDateTime</span></a></p></td>
 <td class="parameter_annotations"> </td>
 </tr></tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="g-date-time-get-utc-offset.returns"></a><h4>Returns</h4>
 <p> the number of microseconds that should be added to UTC to
 get the local time</p>
 </div>
 <p class="since">Since: <a class="link" href="api-index-2-26.html#api-index-2.26">2.26</a></p>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-date-time-get-timezone-abbreviation"></a><h3>g_date_time_get_timezone_abbreviation ()</h3>
 <pre class="programlisting">const <a class="link" href="glib-Basic-Types.html#gchar" title="gchar"><span class="returnvalue">gchar</span></a> *
 g_date_time_get_timezone_abbreviation (<em class="parameter"><code><a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="type">GDateTime</span></a> *datetime</code></em>);</pre>
 <p>Determines the time zone abbreviation to be used at the time and in
 the time zone of <em class="parameter"><code>datetime</code></em>
 .</p>
 <p>For example, in Toronto this is currently "EST" during the winter
 months and "EDT" during the summer months when daylight savings
 time is in effect.</p>
 <div class="refsect3">
 <a name="g-date-time-get-timezone-abbreviation.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody><tr>
 <td class="parameter_name"><p>datetime</p></td>
 <td class="parameter_description"><p>a <a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="type">GDateTime</span></a></p></td>
 <td class="parameter_annotations"> </td>
 </tr></tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="g-date-time-get-timezone-abbreviation.returns"></a><h4>Returns</h4>
 <p> the time zone abbreviation. The returned
 string is owned by the <a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="type">GDateTime</span></a> and it should not be
 modified or freed. </p>
 <p><span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>]</span></p>
 </div>
 <p class="since">Since: <a class="link" href="api-index-2-26.html#api-index-2.26">2.26</a></p>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-date-time-is-daylight-savings"></a><h3>g_date_time_is_daylight_savings ()</h3>
 <pre class="programlisting"><a class="link" href="glib-Basic-Types.html#gboolean" title="gboolean"><span class="returnvalue">gboolean</span></a>
 g_date_time_is_daylight_savings (<em class="parameter"><code><a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="type">GDateTime</span></a> *datetime</code></em>);</pre>
 <p>Determines if daylight savings time is in effect at the time and in
 the time zone of <em class="parameter"><code>datetime</code></em>
 .</p>
 <div class="refsect3">
 <a name="g-date-time-is-daylight-savings.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody><tr>
 <td class="parameter_name"><p>datetime</p></td>
 <td class="parameter_description"><p>a <a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="type">GDateTime</span></a></p></td>
 <td class="parameter_annotations"> </td>
 </tr></tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="g-date-time-is-daylight-savings.returns"></a><h4>Returns</h4>
 <p> <a class="link" href="glib-Standard-Macros.html#TRUE:CAPS" title="TRUE"><code class="literal">TRUE</code></a> if daylight savings time is in effect</p>
 </div>
 <p class="since">Since: <a class="link" href="api-index-2-26.html#api-index-2.26">2.26</a></p>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-date-time-to-timezone"></a><h3>g_date_time_to_timezone ()</h3>
 <pre class="programlisting"><a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="returnvalue">GDateTime</span></a> *
 g_date_time_to_timezone (<em class="parameter"><code><a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="type">GDateTime</span></a> *datetime</code></em>,
                          <em class="parameter"><code><a class="link" href="glib-GTimeZone.html#GTimeZone" title="GTimeZone"><span class="type">GTimeZone</span></a> *tz</code></em>);</pre>
 <p>Create a new <a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="type">GDateTime</span></a> corresponding to the same instant in time as
 <em class="parameter"><code>datetime</code></em>
 , but in the time zone <em class="parameter"><code>tz</code></em>
 .</p>
 <p>This call can fail in the case that the time goes out of bounds.  For
 example, converting 0001-01-01 00:00:00 UTC to a time zone west of
 Greenwich will fail (due to the year 0 being out of range).</p>
 <p>You should release the return value by calling <a class="link" href="glib-GDateTime.html#g-date-time-unref" title="g_date_time_unref ()"><code class="function">g_date_time_unref()</code></a>
 when you are done with it.</p>
 <div class="refsect3">
 <a name="g-date-time-to-timezone.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>datetime</p></td>
 <td class="parameter_description"><p>a <a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="type">GDateTime</span></a></p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>tz</p></td>
 <td class="parameter_description"><p>the new <a class="link" href="glib-GTimeZone.html#GTimeZone" title="GTimeZone"><span class="type">GTimeZone</span></a></p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="g-date-time-to-timezone.returns"></a><h4>Returns</h4>
 <p> a new <a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="type">GDateTime</span></a>, or <a class="link" href="glib-Standard-Macros.html#NULL:CAPS" title="NULL"><code class="literal">NULL</code></a></p>
 </div>
 <p class="since">Since: <a class="link" href="api-index-2-26.html#api-index-2.26">2.26</a></p>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-date-time-to-local"></a><h3>g_date_time_to_local ()</h3>
 <pre class="programlisting"><a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="returnvalue">GDateTime</span></a> *
 g_date_time_to_local (<em class="parameter"><code><a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="type">GDateTime</span></a> *datetime</code></em>);</pre>
 <p>Creates a new <a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="type">GDateTime</span></a> corresponding to the same instant in time as
 <em class="parameter"><code>datetime</code></em>
 , but in the local time zone.</p>
 <p>This call is equivalent to calling <a class="link" href="glib-GDateTime.html#g-date-time-to-timezone" title="g_date_time_to_timezone ()"><code class="function">g_date_time_to_timezone()</code></a> with the
 time zone returned by <a class="link" href="glib-GTimeZone.html#g-time-zone-new-local" title="g_time_zone_new_local ()"><code class="function">g_time_zone_new_local()</code></a>.</p>
 <div class="refsect3">
 <a name="g-date-time-to-local.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody><tr>
 <td class="parameter_name"><p>datetime</p></td>
 <td class="parameter_description"><p>a <a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="type">GDateTime</span></a></p></td>
 <td class="parameter_annotations"> </td>
 </tr></tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="g-date-time-to-local.returns"></a><h4>Returns</h4>
 <p> the newly created <a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="type">GDateTime</span></a></p>
 </div>
 <p class="since">Since: <a class="link" href="api-index-2-26.html#api-index-2.26">2.26</a></p>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-date-time-to-utc"></a><h3>g_date_time_to_utc ()</h3>
 <pre class="programlisting"><a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="returnvalue">GDateTime</span></a> *
 g_date_time_to_utc (<em class="parameter"><code><a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="type">GDateTime</span></a> *datetime</code></em>);</pre>
 <p>Creates a new <a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="type">GDateTime</span></a> corresponding to the same instant in time as
 <em class="parameter"><code>datetime</code></em>
 , but in UTC.</p>
 <p>This call is equivalent to calling <a class="link" href="glib-GDateTime.html#g-date-time-to-timezone" title="g_date_time_to_timezone ()"><code class="function">g_date_time_to_timezone()</code></a> with the
 time zone returned by <a class="link" href="glib-GTimeZone.html#g-time-zone-new-utc" title="g_time_zone_new_utc ()"><code class="function">g_time_zone_new_utc()</code></a>.</p>
 <div class="refsect3">
 <a name="g-date-time-to-utc.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody><tr>
 <td class="parameter_name"><p>datetime</p></td>
 <td class="parameter_description"><p>a <a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="type">GDateTime</span></a></p></td>
 <td class="parameter_annotations"> </td>
 </tr></tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="g-date-time-to-utc.returns"></a><h4>Returns</h4>
 <p> the newly created <a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="type">GDateTime</span></a></p>
 </div>
 <p class="since">Since: <a class="link" href="api-index-2-26.html#api-index-2.26">2.26</a></p>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-date-time-format"></a><h3>g_date_time_format ()</h3>
 <pre class="programlisting"><a class="link" href="glib-Basic-Types.html#gchar" title="gchar"><span class="returnvalue">gchar</span></a> *
 g_date_time_format (<em class="parameter"><code><a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="type">GDateTime</span></a> *datetime</code></em>,
                     <em class="parameter"><code>const <a class="link" href="glib-Basic-Types.html#gchar" title="gchar"><span class="type">gchar</span></a> *format</code></em>);</pre>
 <p>Creates a newly allocated string representing the requested <em class="parameter"><code>format</code></em>
 .</p>
 <p>The format strings understood by this function are a subset of the
 <code class="function">strftime()</code> format language as specified by C99.  The %D, %U and %W
 conversions are not supported, nor is the 'E' modifier.  The GNU
 extensions %k, %l, %s and %P are supported, however, as are the
 '0', '_' and '-' modifiers.</p>
 <p>In contrast to <code class="function">strftime()</code>, this function always produces a UTF-8
 string, regardless of the current locale.  Note that the rendering of
 many formats is locale-dependent and may not match the <code class="function">strftime()</code>
 output exactly.</p>
 <p>The following format specifiers are supported:</p>
 <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
 <li class="listitem"><p>%a: the abbreviated weekday name according to the current locale</p></li>
 <li class="listitem"><p>%A: the full weekday name according to the current locale</p></li>
 <li class="listitem"><p>%b: the abbreviated month name according to the current locale</p></li>
 <li class="listitem"><p>%B: the full month name according to the current locale</p></li>
 <li class="listitem"><p>%c: the preferred date and time representation for the current locale</p></li>
 <li class="listitem"><p>%C: the century number (year/100) as a 2-digit integer (00-99)</p></li>
 <li class="listitem"><p>%d: the day of the month as a decimal number (range 01 to 31)</p></li>
 <li class="listitem"><p>%e: the day of the month as a decimal number (range  1 to 31)</p></li>
 <li class="listitem"><p>%F: equivalent to <code class="literal">%Y-%m-%d</code> (the ISO 8601 date format)</p></li>
 <li class="listitem"><p>%g: the last two digits of the ISO 8601 week-based year as a
 decimal number (00-99). This works well with %V and %u.</p></li>
 <li class="listitem"><p>%G: the ISO 8601 week-based year as a decimal number. This works
 well with %V and %u.</p></li>
 <li class="listitem"><p>%h: equivalent to %b</p></li>
 <li class="listitem"><p>%H: the hour as a decimal number using a 24-hour clock (range 00 to 23)</p></li>
 <li class="listitem"><p>%I: the hour as a decimal number using a 12-hour clock (range 01 to 12)</p></li>
 <li class="listitem"><p>%j: the day of the year as a decimal number (range 001 to 366)</p></li>
 <li class="listitem"><p>%k: the hour (24-hour clock) as a decimal number (range 0 to 23);
 single digits are preceded by a blank</p></li>
 <li class="listitem"><p>%l: the hour (12-hour clock) as a decimal number (range 1 to 12);
 single digits are preceded by a blank</p></li>
 <li class="listitem"><p>%m: the month as a decimal number (range 01 to 12)</p></li>
 <li class="listitem"><p>%M: the minute as a decimal number (range 00 to 59)</p></li>
 <li class="listitem"><p>%p: either "AM" or "PM" according to the given time value, or the
 corresponding  strings for the current locale.  Noon is treated as
 "PM" and midnight as "AM".</p></li>
 <li class="listitem"><p>%P: like %p but lowercase: "am" or "pm" or a corresponding string for
 the current locale</p></li>
 <li class="listitem"><p>%r: the time in a.m. or p.m. notation</p></li>
 <li class="listitem"><p>%R: the time in 24-hour notation (%H:%M)</p></li>
 <li class="listitem"><p>%s: the number of seconds since the Epoch, that is, since 1970-01-01
 00:00:00 UTC</p></li>
 <li class="listitem"><p>%S: the second as a decimal number (range 00 to 60)</p></li>
 <li class="listitem"><p>%t: a tab character</p></li>
 <li class="listitem"><p>%T: the time in 24-hour notation with seconds (%H:%M:%S)</p></li>
 <li class="listitem"><p>%u: the ISO 8601 standard day of the week as a decimal, range 1 to 7,
 Monday being 1. This works well with %G and %V.</p></li>
 <li class="listitem"><p>%V: the ISO 8601 standard week number of the current year as a decimal
 number, range 01 to 53, where week 1 is the first week that has at
 least 4 days in the new year. See <a class="link" href="glib-GDateTime.html#g-date-time-get-week-of-year" title="g_date_time_get_week_of_year ()"><code class="function">g_date_time_get_week_of_year()</code></a>.
 This works well with %G and %u.</p></li>
 <li class="listitem"><p>%w: the day of the week as a decimal, range 0 to 6, Sunday being 0.
 This is not the ISO 8601 standard format -- use %u instead.</p></li>
 <li class="listitem"><p>%x: the preferred date representation for the current locale without
 the time</p></li>
 <li class="listitem"><p>%X: the preferred time representation for the current locale without
 the date</p></li>
 <li class="listitem"><p>%y: the year as a decimal number without the century</p></li>
 <li class="listitem"><p>%Y: the year as a decimal number including the century</p></li>
 <li class="listitem"><p>%z: the time zone as an offset from UTC (+hhmm)</p></li>
 <li class="listitem"><p>%:z: the time zone as an offset from UTC (+hh:mm).
 This is a gnulib <code class="function">strftime()</code> extension. Since: 2.38</p></li>
 <li class="listitem"><p>%::z: the time zone as an offset from UTC (+hh:mm:ss). This is a
 gnulib <code class="function">strftime()</code> extension. Since: 2.38</p></li>
 <li class="listitem"><p>%:::z: the time zone as an offset from UTC, with : to necessary
 precision (e.g., -04, +05:30). This is a gnulib <code class="function">strftime()</code> extension. Since: 2.38</p></li>
 <li class="listitem"><p>%Z: the time zone or name or abbreviation</p></li>
 <li class="listitem"><p>%%: a literal % character</p></li>
 </ul></div>
 <p>Some conversion specifications can be modified by preceding the
 conversion specifier by one or more modifier characters. The
 following modifiers are supported for many of the numeric
 conversions:</p>
 <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
 <li class="listitem"><p>O: Use alternative numeric symbols, if the current locale supports those.</p></li>
 <li class="listitem"><p>_: Pad a numeric result with spaces. This overrides the default padding
 for the specifier.</p></li>
 <li class="listitem"><p>-: Do not pad a numeric result. This overrides the default padding
 for the specifier.</p></li>
 <li class="listitem"><p>0: Pad a numeric result with zeros. This overrides the default padding
 for the specifier.</p></li>
 </ul></div>
 <div class="refsect3">
 <a name="g-date-time-format.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>datetime</p></td>
 <td class="parameter_description"><p>A <a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="type">GDateTime</span></a></p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>format</p></td>
 <td class="parameter_description"><p>a valid UTF-8 string, containing the format for the
 <a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="type">GDateTime</span></a></p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="g-date-time-format.returns"></a><h4>Returns</h4>
 <p> a newly allocated string formatted to the requested format
 or <a class="link" href="glib-Standard-Macros.html#NULL:CAPS" title="NULL"><code class="literal">NULL</code></a> in the case that there was an error. The string
 should be freed with <a class="link" href="glib-Memory-Allocation.html#g-free" title="g_free ()"><code class="function">g_free()</code></a>.</p>
 </div>
 <p class="since">Since: <a class="link" href="api-index-2-26.html#api-index-2.26">2.26</a></p>
 </div>
 </div>
 <div class="refsect1">
 <a name="glib-GDateTime.other_details"></a><h2>Types and Values</h2>
 <div class="refsect2">
 <a name="GTimeSpan"></a><h3>GTimeSpan</h3>
 <pre class="programlisting">typedef gint64 GTimeSpan;
 </pre>
 <p>A value representing an interval of time, in microseconds.</p>
 <p class="since">Since: <a class="link" href="api-index-2-26.html#api-index-2.26">2.26</a></p>
 </div>
 <hr>
 <div class="refsect2">
 <a name="G-TIME-SPAN-DAY:CAPS"></a><h3>G_TIME_SPAN_DAY</h3>
 <pre class="programlisting">#define G_TIME_SPAN_DAY                 (G_GINT64_CONSTANT (86400000000))
 </pre>
 <p>Evaluates to a time span of one day.</p>
 <p class="since">Since: <a class="link" href="api-index-2-26.html#api-index-2.26">2.26</a></p>
 </div>
 <hr>
 <div class="refsect2">
 <a name="G-TIME-SPAN-HOUR:CAPS"></a><h3>G_TIME_SPAN_HOUR</h3>
 <pre class="programlisting">#define G_TIME_SPAN_HOUR                (G_GINT64_CONSTANT (3600000000))
 </pre>
 <p>Evaluates to a time span of one hour.</p>
 <p class="since">Since: <a class="link" href="api-index-2-26.html#api-index-2.26">2.26</a></p>
 </div>
 <hr>
 <div class="refsect2">
 <a name="G-TIME-SPAN-MINUTE:CAPS"></a><h3>G_TIME_SPAN_MINUTE</h3>
 <pre class="programlisting">#define G_TIME_SPAN_MINUTE              (G_GINT64_CONSTANT (60000000))
 </pre>
 <p>Evaluates to a time span of one minute.</p>
 <p class="since">Since: <a class="link" href="api-index-2-26.html#api-index-2.26">2.26</a></p>
 </div>
 <hr>
 <div class="refsect2">
 <a name="G-TIME-SPAN-SECOND:CAPS"></a><h3>G_TIME_SPAN_SECOND</h3>
 <pre class="programlisting">#define G_TIME_SPAN_SECOND              (G_GINT64_CONSTANT (1000000))
 </pre>
 <p>Evaluates to a time span of one second.</p>
 <p class="since">Since: <a class="link" href="api-index-2-26.html#api-index-2.26">2.26</a></p>
 </div>
 <hr>
 <div class="refsect2">
 <a name="G-TIME-SPAN-MILLISECOND:CAPS"></a><h3>G_TIME_SPAN_MILLISECOND</h3>
 <pre class="programlisting">#define G_TIME_SPAN_MILLISECOND         (G_GINT64_CONSTANT (1000))
 </pre>
 <p>Evaluates to a time span of one millisecond.</p>
 <p class="since">Since: <a class="link" href="api-index-2-26.html#api-index-2.26">2.26</a></p>
 </div>
 <hr>
 <div class="refsect2">
 <a name="GDateTime"></a><h3>GDateTime</h3>
 <pre class="programlisting">typedef struct _GDateTime GDateTime;</pre>
 <p><code class="literal">GDateTime</code> is an opaque structure whose members
 cannot be accessed directly.</p>
 <p class="since">Since: <a class="link" href="api-index-2-26.html#api-index-2.26">2.26</a></p>
 </div>
 </div>
 <div class="refsect1">
 <a name="glib-GDateTime.see-also"></a><h2>See Also</h2>
 <p><a class="link" href="glib-GTimeZone.html#GTimeZone" title="GTimeZone"><span class="type">GTimeZone</span></a></p>
 </div>
 </div>
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