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| <div class="titlepage"><div><div><h2 class="title" style="clear: both"> |
| <a name="date_time.examples.general_usage_examples"></a>General Usage Examples</h2></div></div></div> |
| <p> |
| The following provides some sample usage of dates. |
| See <a class="link" href="../gregorian.html" title="Gregorian">Date Programming</a> |
| for more details. |
| |
| </p> |
| <pre class="programlisting"><span class="keyword">using namespace</span> boost::gregorian; |
| date weekstart(<span class="number">2002</span>,Feb,<span class="number">1</span>); |
| date weekend = weekstart + week(<span class="number">1</span>); |
| date d2 = d1 + days(<span class="number">5</span>); |
| date today = day_clock::local_day(); |
| if (d2 >= today) {} <span class="comment">//date comparison operators</span> |
| |
| date_period thisWeek(d1,d2); |
| <span class="keyword">if</span> (thisWeek.contains(today)) {}<span class="comment">//do something |
| |
| //iterate and print the week</span> |
| day_iterator itr(weekstart); |
| <span class="keyword">while</span> (itr <= weekend) { |
| std::cout << (*itr) << std::endl; |
| ++itr; |
| } |
| <span class="comment">//input streaming</span> |
| std::stringstream ss(<span class="string">"2004-Jan-1"</span>); |
| ss >> d3; |
| |
| <span class="comment">//date generator functions</span> |
| date d5 = next_weekday(d4, Sunday); <span class="comment">//calculate Sunday following d4 |
| |
| //US labor day is first Monday in Sept</span> |
| nth_day_of_the_week_in_month labor_day(nth_dow::first,Monday, Sep); |
| <span class="comment">//calculate a specific date for 2004 from functor</span> |
| date d6 = labor_day.get_date(<span class="number">2004</span>); |
| </pre> |
| <p> |
| |
| The following provides some example code using times. |
| See <a class="link" href="../posix_time.html" title="Posix Time">Time Programming</a> |
| for more details. |
| |
| </p> |
| <pre class="programlisting"><span class="keyword">using namespace</span> boost::posix_time; |
| date d(<span class="number">2002</span>,Feb,<span class="number">1</span>); <span class="comment">//an arbitrary date</span> |
| ptime t1(d, hours(<span class="number">5</span>)+nanosec(<span class="number">100</span>)); <span class="comment">//date + time of day offset</span> |
| ptime t2 = t1 - minutes(<span class="number">4</span>)+seconds(<span class="number">2</span>); |
| ptime now = second_clock::local_time(); <span class="comment">//use the clock</span> |
| date today = now.date(); <span class="comment">//Get the date part out of the time</span> |
| date tomorrow = today + date_duration(<span class="number">1</span>); |
| ptime tomorrow_start(tomorrow); <span class="comment">//midnight |
| |
| //input streaming</span> |
| std::stringstream ss(<span class="string">"2004-Jan-1 05:21:33.20"</span>); |
| ss >> t2; |
| |
| <span class="comment">//starting at current time iterator adds by one hour</span> |
| time_iterator titr(now,hours(<span class="number">1</span>)); |
| <span class="keyword">for</span> (; titr < tomorrow_start; ++titr) { |
| std::cout << (*titr) << std::endl; |
| } |
| </pre> |
| <p> |
| </p> |
| <p> |
| The following provides some example code using times. |
| See <a class="link" href="../local_time.html" title="Local Time">Local Time Programming</a> |
| for more details. |
| |
| </p> |
| <pre class="programlisting"> |
| <span class="keyword">using namespace</span> boost::local_time; |
| <span class="comment">//setup some timezones for creating and adjusting times |
| //first time zone uses the time zone file for regional timezone definitions</span> |
| tz_database tz_db; |
| tz_db.load_from_file(<span class="string">"date_time_zonespec.csv"</span>); |
| time_zone_ptr nyc_tz = tz_db.time_zone_from_region(<span class="string">"America/New_York"</span>); |
| <span class="comment">//This timezone uses a posix time zone string definition to create a time zone</span> |
| time_zone_ptr phx_tz(new posix_time_zone(<span class="string">"MST-07:00:00"</span>)); |
| |
| <span class="comment">//local departure time in phoenix is 11 pm on April 2 2005 |
| // Note that New York changes to daylight savings on Apr 3 at 2 am)</span> |
| local_date_time phx_departure(date(<span class="number">2005</span>, Apr, <span class="number">2</span>), hours(<span class="number">23</span>), phx_tz, |
| local_date_time::NOT_DATE_TIME_ON_ERROR); |
| |
| time_duration flight_length = hours(<span class="number">4</span>) + minutes(<span class="number">30</span>); |
| local_date_time phx_arrival = phx_departure + flight_length; |
| <span class="comment">//convert the phx time to a nyz time</span> |
| local_date_time nyc_arrival = phx_arrival.local_time_in(nyc_tz); |
| |
| <span class="comment">//2005-Apr-03 06:30:00 EDT</span> |
| std::cout << nyc_arrival << std::endl; |
| </pre> |
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| <code class="filename">LICENSE_1_0.txt</code> or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)</p> |
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