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| <div class="section"> |
| <div class="titlepage"><div><div><h2 class="title" style="clear: both"> |
| <a name="date_time.examples"></a>Examples</h2></div></div></div> |
| <div class="toc"><dl> |
| <dt><span class="section"><a href="examples.html#date_time.examples.dates_as_strings">Dates as Strings</a></span></dt> |
| <dt><span class="section"><a href="examples.html#date_time.examples.days_alive">Days Alive</a></span></dt> |
| <dt><span class="section"><a href="examples.html#date_time.examples.days_between_new_year">Days Between New Years</a></span></dt> |
| <dt><span class="section"><a href="examples.html#date_time.examples.end_of_month_day">Last Day of the Months</a></span></dt> |
| <dt><span class="section"><a href="examples.html#date_time.examples.localization">Localization Demonstration</a></span></dt> |
| <dt><span class="section"><a href="examples.html#date_time.examples.date_period_calc">Date Period Calculations</a></span></dt> |
| <dt><span class="section"><a href="examples.html#date_time.examples.print_holidays">Print Holidays</a></span></dt> |
| <dt><span class="section"><a href="examples.html#date_time.examples.print_month">Print Month</a></span></dt> |
| <dt><span class="section"><a href="examples.html#date_time.examples.month_add">Month Adding</a></span></dt> |
| <dt><span class="section"><a href="examples.html#date_time.examples.time_math">Time Math</a></span></dt> |
| <dt><span class="section"><a href="examples.html#date_time.examples.print_hours">Print Hours</a></span></dt> |
| <dt><span class="section"><a href="examples.html#date_time.examples.local_utc_conversion">Local to UTC Conversion</a></span></dt> |
| <dt><span class="section"><a href="examples.html#date_time.examples.time_periods">Time Periods</a></span></dt> |
| <dt><span class="section"><a href="examples.html#date_time.examples.simple_time_zone">Simple Time Zones</a></span></dt> |
| <dt><span class="section"><a href="examples.html#date_time.examples.calc_rules">Daylight Savings Calc Rules</a></span></dt> |
| <dt><span class="section"><a href="examples.html#date_time.examples.flight">Flight Time Example</a></span></dt> |
| <dt><span class="section"><a href="examples.html#date_time.examples.seconds_since_epoch">Seconds Since Epoch</a></span></dt> |
| </dl></div> |
| <div class="section"> |
| <div class="titlepage"><div><div><h3 class="title"> |
| <a name="date_time.examples.dates_as_strings"></a>Dates as Strings</h3></div></div></div> |
| <p> |
| Various parsing and output of strings. |
| </p> |
| <pre class="programlisting"> |
| |
| |
| /* The following is a simple example that shows conversion of dates |
| * to and from a std::string. |
| * |
| * Expected output: |
| * 2001-Oct-09 |
| * 2001-10-09 |
| * Tuesday October 9, 2001 |
| * An expected exception is next: |
| * Exception: Month number is out of range 1..12 |
| */ |
| |
| #include "boost/date_time/gregorian/gregorian.hpp" |
| #include <iostream> |
| #include <string> |
| |
| int |
| main() |
| { |
| |
| using namespace boost::gregorian; |
| |
| try { |
| // The following date is in ISO 8601 extended format (CCYY-MM-DD) |
| std::string s("2001-10-9"); //2001-October-09 |
| date d(from_simple_string(s)); |
| std::cout << to_simple_string(d) << std::endl; |
| |
| //Read ISO Standard(CCYYMMDD) and output ISO Extended |
| std::string ud("20011009"); //2001-Oct-09 |
| date d1(from_undelimited_string(ud)); |
| std::cout << to_iso_extended_string(d1) << std::endl; |
| |
| //Output the parts of the date - Tuesday October 9, 2001 |
| date::ymd_type ymd = d1.year_month_day(); |
| greg_weekday wd = d1.day_of_week(); |
| std::cout << wd.as_long_string() << " " |
| << ymd.month.as_long_string() << " " |
| << ymd.day << ", " << ymd.year |
| << std::endl; |
| |
| //Let's send in month 25 by accident and create an exception |
| std::string bad_date("20012509"); //2001-??-09 |
| std::cout << "An expected exception is next: " << std::endl; |
| date wont_construct(from_undelimited_string(bad_date)); |
| //use wont_construct so compiler doesn't complain, but you wont get here! |
| std::cout << "oh oh, you shouldn't reach this line: " |
| << to_iso_string(wont_construct) << std::endl; |
| } |
| catch(std::exception& e) { |
| std::cout << " Exception: " << e.what() << std::endl; |
| } |
| |
| |
| return 0; |
| } |
| |
| |
| </pre> |
| </div> |
| <div class="section"> |
| <div class="titlepage"><div><div><h3 class="title"> |
| <a name="date_time.examples.days_alive"></a>Days Alive</h3></div></div></div> |
| <p> |
| Calculate the number of days you have been living using durations and dates. |
| </p> |
| <pre class="programlisting"> |
| <code class="literal"> |
| <span class="comment">/* Short example that calculates the number of days since user was born. |
| * Demonstrates comparisons of durations, use of the day_clock, |
| * and parsing a date from a string. |
| */</span><span class="preprocessor"> |
| |
| #include</span><span class="string"> "boost/date_time/gregorian/gregorian.hpp"</span><span class="preprocessor"> |
| #include</span><span class="special"> <</span><span class="identifier">iostream</span><span class="special">></span><span class="keyword"> |
| |
| int</span><span class="identifier"> |
| main</span><span class="special">()</span><span class="special"> |
| {</span><span class="keyword"> |
| |
| using</span><span class="keyword"> namespace</span><span class="identifier"> boost</span><span class="special">::</span><span class="identifier">gregorian</span><span class="special">;</span><span class="identifier"> |
| std</span><span class="special">::</span><span class="identifier">string</span><span class="identifier"> s</span><span class="special">;</span><span class="identifier"> |
| std</span><span class="special">::</span><span class="identifier">cout</span><span class="special"> <<</span><span class="string"> "Enter birth day YYYY-MM-DD (eg: 2002-02-01): "</span><span class="special">;</span><span class="identifier"> |
| std</span><span class="special">::</span><span class="identifier">cin</span><span class="special"> >></span><span class="identifier"> s</span><span class="special">;</span><span class="keyword"> |
| try</span><span class="special"> {</span><span class="identifier"> |
| date</span><span class="identifier"> birthday</span><span class="special">(</span><span class="identifier">from_simple_string</span><span class="special">(</span><span class="identifier">s</span><span class="special">));</span><span class="identifier"> |
| date</span><span class="identifier"> today</span><span class="special"> =</span><span class="identifier"> day_clock</span><span class="special">::</span><span class="identifier">local_day</span><span class="special">();</span><span class="identifier"> |
| days</span><span class="identifier"> days_alive</span><span class="special"> =</span><span class="identifier"> today</span><span class="special"> -</span><span class="identifier"> birthday</span><span class="special">;</span><span class="identifier"> |
| days</span><span class="identifier"> one_day</span><span class="special">(</span><span class="number">1</span><span class="special">);</span><span class="keyword"> |
| if</span><span class="special"> (</span><span class="identifier">days_alive</span><span class="special"> ==</span><span class="identifier"> one_day</span><span class="special">)</span><span class="special"> {</span><span class="identifier"> |
| std</span><span class="special">::</span><span class="identifier">cout</span><span class="special"> <<</span><span class="string"> "Born yesterday, very funny"</span><span class="special"> <<</span><span class="identifier"> std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span><span class="special"> |
| }</span><span class="keyword"> |
| else</span><span class="keyword"> if</span><span class="special"> (</span><span class="identifier">days_alive</span><span class="special"> <</span><span class="identifier"> days</span><span class="special">(</span><span class="number">0</span><span class="special">))</span><span class="special"> {</span><span class="identifier"> |
| std</span><span class="special">::</span><span class="identifier">cout</span><span class="special"> <<</span><span class="string"> "Not born yet, hmm: "</span><span class="special"> <<</span><span class="identifier"> days_alive</span><span class="special">.</span><span class="identifier">days</span><span class="special">()</span><span class="special"> |
| <<</span><span class="string"> " days"</span><span class="special"> <<</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span><span class="special"> |
| }</span><span class="keyword"> |
| else</span><span class="special"> {</span><span class="identifier"> |
| std</span><span class="special">::</span><span class="identifier">cout</span><span class="special"> <<</span><span class="string"> "Days alive: "</span><span class="special"> <<</span><span class="identifier"> days_alive</span><span class="special">.</span><span class="identifier">days</span><span class="special">()</span><span class="special"> <<</span><span class="identifier"> std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span><span class="special"> |
| }</span><span class="special"> |
| |
| }</span><span class="keyword"> |
| catch</span><span class="special">(...)</span><span class="special"> {</span><span class="identifier"> |
| std</span><span class="special">::</span><span class="identifier">cout</span><span class="special"> <<</span><span class="string"> "Bad date entered: "</span><span class="special"> <<</span><span class="identifier"> s</span><span class="special"> <<</span><span class="identifier"> std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span><span class="special"> |
| }</span><span class="keyword"> |
| return</span><span class="number"> 0</span><span class="special">;</span><span class="special"> |
| }</span> |
| </code> |
| </pre> |
| </div> |
| <div class="section"> |
| <div class="titlepage"><div><div><h3 class="title"> |
| <a name="date_time.examples.days_between_new_year"></a>Days Between New Years</h3></div></div></div> |
| <p> |
| Calculate the number of days till new years |
| </p> |
| <pre class="programlisting"> |
| |
| /* Provides a simple example of using a date_generator, and simple |
| * mathematical operatorations, to calculate the days since |
| * New Years day of this year, and days until next New Years day. |
| * |
| * Expected results: |
| * Adding together both durations will produce 366 (365 in a leap year). |
| */ |
| #include <iostream> |
| #include "boost/date_time/gregorian/gregorian.hpp" |
| |
| int |
| main() |
| { |
| |
| using namespace boost::gregorian; |
| |
| date today = day_clock::local_day(); |
| partial_date new_years_day(1,Jan); |
| //Subtract two dates to get a duration |
| days days_since_year_start = today - new_years_day.get_date(today.year()); |
| std::cout << "Days since Jan 1: " << days_since_year_start.days() |
| << std::endl; |
| |
| days days_until_year_start = new_years_day.get_date(today.year()+1) - today; |
| std::cout << "Days until next Jan 1: " << days_until_year_start.days() |
| << std::endl; |
| return 0; |
| }; |
| |
| |
| </pre> |
| </div> |
| <div class="section"> |
| <div class="titlepage"><div><div><h3 class="title"> |
| <a name="date_time.examples.end_of_month_day"></a>Last Day of the Months</h3></div></div></div> |
| <p> |
| Example that gets a month and a year from the user and finds the last day of each remaining month of that year. |
| </p> |
| <pre class="programlisting"> |
| |
| /* Simple program that finds the last day of the given month, |
| * then displays the last day of every month left in the given year. |
| */ |
| |
| #include "boost/date_time/gregorian/gregorian.hpp" |
| #include <iostream> |
| |
| int |
| main() |
| { |
| using namespace boost::gregorian; |
| |
| greg_year year(1400); |
| greg_month month(1); |
| |
| // get a month and a year from the user |
| try { |
| int y, m; |
| std::cout << " Enter Year(ex: 2002): "; |
| std::cin >> y; |
| year = greg_year(y); |
| std::cout << " Enter Month(1..12): "; |
| std::cin >> m; |
| month = greg_month(m); |
| } |
| catch(bad_year by) { |
| std::cout << "Invalid Year Entered: " << by.what() << '\n' |
| << "Using minimum values for month and year." << std::endl; |
| } |
| catch(bad_month bm) { |
| std::cout << "Invalid Month Entered" << bm.what() << '\n' |
| << "Using minimum value for month. " << std::endl; |
| } |
| |
| date start_of_next_year(year+1, Jan, 1); |
| date d(year, month, 1); |
| |
| // add another month to d until we enter the next year. |
| while (d < start_of_next_year){ |
| std::cout << to_simple_string(d.end_of_month()) << std::endl; |
| d += months(1); |
| } |
| |
| return 0; |
| } |
| |
| |
| </pre> |
| </div> |
| <div class="section"> |
| <div class="titlepage"><div><div><h3 class="title"> |
| <a name="date_time.examples.localization"></a>Localization Demonstration</h3></div></div></div> |
| <p> |
| The boost::date_time library provides the ability to create customized locale facets. Date ordering, language, seperators, and abbreviations can be customized. |
| </p> |
| <pre class="programlisting"> |
| |
| /* The following shows the creation of a facet for the output of |
| * dates in German (please forgive me for any errors in my German -- |
| * I'm not a native speaker). |
| */ |
| |
| #include "boost/date_time/gregorian/gregorian.hpp" |
| #include <iostream> |
| #include <algorithm> |
| |
| /* Define a series of char arrays for short and long name strings |
| * to be associated with German date output (US names will be |
| * retrieved from the locale). */ |
| const char* const de_short_month_names[] = |
| { |
| "Jan", "Feb", "Mar", "Apr", "Mai", "Jun", |
| "Jul", "Aug", "Sep", "Okt", "Nov", "Dez", "NAM" |
| }; |
| const char* const de_long_month_names[] = |
| { |
| "Januar", "Februar", "Marz", "April", "Mai", |
| "Juni", "Juli", "August", "September", "Oktober", |
| "November", "Dezember", "NichtDerMonat" |
| }; |
| const char* const de_long_weekday_names[] = |
| { |
| "Sonntag", "Montag", "Dienstag", "Mittwoch", |
| "Donnerstag", "Freitag", "Samstag" |
| }; |
| const char* const de_short_weekday_names[] = |
| { |
| "Son", "Mon", "Die","Mit", "Don", "Fre", "Sam" |
| }; |
| |
| |
| int main() |
| { |
| using namespace boost::gregorian; |
| |
| // create some gregorian objects to output |
| date d1(2002, Oct, 1); |
| greg_month m = d1.month(); |
| greg_weekday wd = d1.day_of_week(); |
| |
| // create a facet and a locale for German dates |
| date_facet* german_facet = new date_facet(); |
| std::cout.imbue(std::locale(std::locale::classic(), german_facet)); |
| |
| // create the German name collections |
| date_facet::input_collection_type short_months, long_months, |
| short_weekdays, long_weekdays; |
| std::copy(&de_short_month_names[0], &de_short_month_names[11], |
| std::back_inserter(short_months)); |
| std::copy(&de_long_month_names[0], &de_long_month_names[11], |
| std::back_inserter(long_months)); |
| std::copy(&de_short_weekday_names[0], &de_short_weekday_names[6], |
| std::back_inserter(short_weekdays)); |
| std::copy(&de_long_weekday_names[0], &de_long_weekday_names[6], |
| std::back_inserter(long_weekdays)); |
| |
| // replace the default names with ours |
| // NOTE: date_generators and special_values were not replaced as |
| // they are not used in this example |
| german_facet->short_month_names(short_months); |
| german_facet->long_month_names(long_months); |
| german_facet->short_weekday_names(short_weekdays); |
| german_facet->long_weekday_names(long_weekdays); |
| |
| // output the date in German using short month names |
| german_facet->format("%d.%m.%Y"); |
| std::cout << d1 << std::endl; //01.10.2002 |
| |
| german_facet->month_format("%B"); |
| std::cout << m << std::endl; //Oktober |
| |
| german_facet->weekday_format("%A"); |
| std::cout << wd << std::endl; //Dienstag |
| |
| |
| // Output the same gregorian objects using US names |
| date_facet* us_facet = new date_facet(); |
| std::cout.imbue(std::locale(std::locale::classic(), us_facet)); |
| |
| us_facet->format("%m/%d/%Y"); |
| std::cout << d1 << std::endl; // 10/01/2002 |
| |
| // English names, iso order (year-month-day), '-' separator |
| us_facet->format("%Y-%b-%d"); |
| std::cout << d1 << std::endl; // 2002-Oct-01 |
| |
| return 0; |
| |
| } |
| |
| </pre> |
| </div> |
| <div class="section"> |
| <div class="titlepage"><div><div><h3 class="title"> |
| <a name="date_time.examples.date_period_calc"></a>Date Period Calculations</h3></div></div></div> |
| <p> |
| Calculates if a date is in an 'irregular' collection of periods using period calculation functions. |
| </p> |
| <pre class="programlisting"> |
| |
| /* |
| This example demonstrates a simple use of periods for the calculation |
| of date information. |
| |
| The example calculates if a given date is a weekend or holiday |
| given an exclusion set. That is, each weekend or holiday is |
| entered into the set as a time interval. Then if a given date |
| is contained within any of the intervals it is considered to |
| be within the exclusion set and hence is a offtime. |
| |
| Output: |
| Number Excluded Periods: 5 |
| 20020202/20020203 |
| 20020209/20020210 |
| 20020212/20020212 |
| 20020216/20020217 |
| In Exclusion Period: 20020216 --> 20020216/20020217 |
| 20020223/20020224 |
| |
| */ |
| |
| |
| #include "boost/date_time/gregorian/gregorian.hpp" |
| #include <set> |
| #include <algorithm> |
| #include <iostream> |
| |
| typedef std::set<boost::gregorian::date_period> date_period_set; |
| |
| //Simple population of the exclusion set |
| date_period_set |
| generateExclusion() |
| { |
| using namespace boost::gregorian; |
| date_period periods_array[] = |
| { date_period(date(2002,Feb,2), date(2002,Feb,4)),//weekend of 2nd-3rd |
| date_period(date(2002,Feb,9), date(2002,Feb,11)), |
| date_period(date(2002,Feb,16), date(2002,Feb,18)), |
| date_period(date(2002,Feb,23), date(2002,Feb,25)), |
| date_period(date(2002,Feb,12), date(2002,Feb,13))//a random holiday 2-12 |
| }; |
| const int num_periods = sizeof(periods_array)/sizeof(date_period); |
| |
| date_period_set ps; |
| //insert the periods in the set |
| std::insert_iterator<date_period_set> itr(ps, ps.begin()); |
| std::copy(periods_array, periods_array+num_periods, itr ); |
| return ps; |
| |
| } |
| |
| |
| int main() |
| { |
| using namespace boost::gregorian; |
| |
| date_period_set ps = generateExclusion(); |
| std::cout << "Number Excluded Periods: " << ps.size() << std::endl; |
| |
| date d(2002,Feb,16); |
| date_period_set::const_iterator i = ps.begin(); |
| //print the periods, check for containment |
| for (;i != ps.end(); i++) { |
| std::cout << to_iso_string(*i) << std::endl; |
| //if date is in exclusion period then print it |
| if (i->contains(d)) { |
| std::cout << "In Exclusion Period: " |
| << to_iso_string(d) << " --> " << to_iso_string(*i) |
| << std::endl; |
| } |
| } |
| |
| return 0; |
| |
| } |
| |
| |
| </pre> |
| </div> |
| <div class="section"> |
| <div class="titlepage"><div><div><h3 class="title"> |
| <a name="date_time.examples.print_holidays"></a>Print Holidays</h3></div></div></div> |
| <p> |
| This is an example of using functors to define a holiday schedule |
| </p> |
| <pre class="programlisting"> |
| |
| |
| /* Generate a set of dates using a collection of date generators |
| * Output looks like: |
| * Enter Year: 2002 |
| * 2002-Jan-01 [Tue] |
| * 2002-Jan-21 [Mon] |
| * 2002-Feb-12 [Tue] |
| * 2002-Jul-04 [Thu] |
| * 2002-Sep-02 [Mon] |
| * 2002-Nov-28 [Thu] |
| * 2002-Dec-25 [Wed] |
| * Number Holidays: 7 |
| */ |
| |
| #include "boost/date_time/gregorian/gregorian.hpp" |
| #include <algorithm> |
| #include <functional> |
| #include <vector> |
| #include <iostream> |
| #include <set> |
| |
| void |
| print_date(boost::gregorian::date d) |
| { |
| using namespace boost::gregorian; |
| #if defined(BOOST_DATE_TIME_NO_LOCALE) |
| std::cout << to_simple_string(d) << " [" << d.day_of_week() << "]\n"; |
| #else |
| std::cout << d << " [" << d.day_of_week() << "]\n"; |
| #endif |
| } |
| |
| |
| int |
| main() { |
| |
| std::cout << "Enter Year: "; |
| int year; |
| std::cin >> year; |
| |
| using namespace boost::gregorian; |
| |
| //define a collection of holidays fixed by month and day |
| std::vector<year_based_generator*> holidays; |
| holidays.push_back(new partial_date(1,Jan)); //Western New Year |
| holidays.push_back(new partial_date(4,Jul)); //US Independence Day |
| holidays.push_back(new partial_date(25, Dec));//Christmas day |
| |
| |
| //define a shorthand for the nth_day_of_the_week_in_month function object |
| typedef nth_day_of_the_week_in_month nth_dow; |
| |
| //US labor day |
| holidays.push_back(new nth_dow(nth_dow::first, Monday, Sep)); |
| //MLK Day |
| holidays.push_back(new nth_dow(nth_dow::third, Monday, Jan)); |
| //Pres day |
| holidays.push_back(new nth_dow(nth_dow::second, Tuesday, Feb)); |
| //Thanksgiving |
| holidays.push_back(new nth_dow(nth_dow::fourth, Thursday, Nov)); |
| |
| typedef std::set<date> date_set; |
| date_set all_holidays; |
| |
| for(std::vector<year_based_generator*>::iterator it = holidays.begin(); |
| it != holidays.end(); ++it) |
| { |
| all_holidays.insert((*it)->get_date(year)); |
| } |
| |
| //print the holidays to the screen |
| std::for_each(all_holidays.begin(), all_holidays.end(), print_date); |
| std::cout << "Number Holidays: " << all_holidays.size() << std::endl; |
| |
| return 0; |
| } |
| |
| |
| </pre> |
| </div> |
| <div class="section"> |
| <div class="titlepage"><div><div><h3 class="title"> |
| <a name="date_time.examples.print_month"></a>Print Month</h3></div></div></div> |
| <p> |
| Simple utility to print out days of the month with the days of a month. Demontstrates date iteration (date_time::date_itr). |
| </p> |
| <pre class="programlisting"> |
| |
| /* This example prints all the dates in a month. It demonstrates |
| * the use of iterators as well as functions of the gregorian_calendar |
| * |
| * Output: |
| * Enter Year: 2002 |
| * Enter Month(1..12): 2 |
| * 2002-Feb-01 [Fri] |
| * 2002-Feb-02 [Sat] |
| * 2002-Feb-03 [Sun] |
| * 2002-Feb-04 [Mon] |
| * 2002-Feb-05 [Tue] |
| * 2002-Feb-06 [Wed] |
| * 2002-Feb-07 [Thu] |
| */ |
| |
| #include "boost/date_time/gregorian/gregorian.hpp" |
| #include <iostream> |
| |
| int |
| main() |
| { |
| std::cout << "Enter Year: "; |
| int year, month; |
| std::cin >> year; |
| std::cout << "Enter Month(1..12): "; |
| std::cin >> month; |
| |
| using namespace boost::gregorian; |
| try { |
| //Use the calendar to get the last day of the month |
| int eom_day = gregorian_calendar::end_of_month_day(year,month); |
| date endOfMonth(year,month,eom_day); |
| |
| //construct an iterator starting with firt day of the month |
| day_iterator ditr(date(year,month,1)); |
| //loop thru the days and print each one |
| for (; ditr <= endOfMonth; ++ditr) { |
| #if defined(BOOST_DATE_TIME_NO_LOCALE) |
| std::cout << to_simple_string(*ditr) << " [" |
| #else |
| std::cout << *ditr << " [" |
| #endif |
| << ditr->day_of_week() << "]" |
| << std::endl; |
| } |
| } |
| catch(std::exception& e) { |
| |
| std::cout << "Error bad date, check your entry: \n" |
| << " Details: " << e.what() << std::endl; |
| } |
| return 0; |
| } |
| |
| |
| </pre> |
| </div> |
| <div class="section"> |
| <div class="titlepage"><div><div><h3 class="title"> |
| <a name="date_time.examples.month_add"></a>Month Adding</h3></div></div></div> |
| <p> |
| Adding a month to a day without the use of iterators. |
| </p> |
| <pre class="programlisting"> |
| |
| /* Simple program that uses the gregorian calendar to progress by exactly |
| * one month, irregardless of how many days are in that month. |
| * |
| * This method can be used as an alternative to iterators |
| */ |
| |
| #include "boost/date_time/gregorian/gregorian.hpp" |
| #include <iostream> |
| |
| int |
| main() |
| { |
| |
| using namespace boost::gregorian; |
| |
| date d = day_clock::local_day(); |
| add_month mf(1); |
| date d2 = d + mf.get_offset(d); |
| std::cout << "Today is: " << to_simple_string(d) << ".\n" |
| << "One month from today will be: " << to_simple_string(d2) |
| << std::endl; |
| |
| return 0; |
| } |
| |
| </pre> |
| </div> |
| <div class="section"> |
| <div class="titlepage"><div><div><h3 class="title"> |
| <a name="date_time.examples.time_math"></a>Time Math</h3></div></div></div> |
| <p> |
| Various types of calculations with times and time durations. |
| </p> |
| <pre class="programlisting"> |
| |
| /* Some simple examples of constructing and calculating with times |
| * Output: |
| * 2002-Feb-01 00:00:00 - 2002-Feb-01 05:04:02.001000000 = -5:04:02.001000000 |
| */ |
| |
| #include "boost/date_time/posix_time/posix_time.hpp" |
| #include <iostream> |
| |
| int |
| main() |
| { |
| using namespace boost::posix_time; |
| using namespace boost::gregorian; |
| |
| date d(2002,Feb,1); //an arbitrary date |
| //construct a time by adding up some durations durations |
| ptime t1(d, hours(5)+minutes(4)+seconds(2)+millisec(1)); |
| //construct a new time by subtracting some times |
| ptime t2 = t1 - hours(5)- minutes(4)- seconds(2)- millisec(1); |
| //construct a duration by taking the difference between times |
| time_duration td = t2 - t1; |
| |
| std::cout << to_simple_string(t2) << " - " |
| << to_simple_string(t1) << " = " |
| << to_simple_string(td) << std::endl; |
| |
| return 0; |
| } |
| |
| </pre> |
| </div> |
| <div class="section"> |
| <div class="titlepage"><div><div><h3 class="title"> |
| <a name="date_time.examples.print_hours"></a>Print Hours</h3></div></div></div> |
| <p> |
| Demonstrate time iteration, clock retrieval, and simple calculation. |
| </p> |
| <pre class="programlisting"> |
| |
| /* Print the remaining hours of the day |
| * Uses the clock to get the local time |
| * Use an iterator to iterate over the remaining hours |
| * Retrieve the date part from a time |
| * |
| * Expected Output something like: |
| * |
| * 2002-Mar-08 16:30:59 |
| * 2002-Mar-08 17:30:59 |
| * 2002-Mar-08 18:30:59 |
| * 2002-Mar-08 19:30:59 |
| * 2002-Mar-08 20:30:59 |
| * 2002-Mar-08 21:30:59 |
| * 2002-Mar-08 22:30:59 |
| * 2002-Mar-08 23:30:59 |
| * Time left till midnight: 07:29:01 |
| */ |
| |
| #include "boost/date_time/posix_time/posix_time.hpp" |
| #include <iostream> |
| |
| int |
| main() |
| { |
| using namespace boost::posix_time; |
| using namespace boost::gregorian; |
| |
| //get the current time from the clock -- one second resolution |
| ptime now = second_clock::local_time(); |
| //Get the date part out of the time |
| date today = now.date(); |
| date tommorrow = today + days(1); |
| ptime tommorrow_start(tommorrow); //midnight |
| |
| //iterator adds by one hour |
| time_iterator titr(now,hours(1)); |
| for (; titr < tommorrow_start; ++titr) { |
| std::cout << to_simple_string(*titr) << std::endl; |
| } |
| |
| time_duration remaining = tommorrow_start - now; |
| std::cout << "Time left till midnight: " |
| << to_simple_string(remaining) << std::endl; |
| return 0; |
| } |
| |
| |
| </pre> |
| </div> |
| <div class="section"> |
| <div class="titlepage"><div><div><h3 class="title"> |
| <a name="date_time.examples.local_utc_conversion"></a>Local to UTC Conversion</h3></div></div></div> |
| <p> |
| Demonstrate utc to local and local to utc calculations including dst. |
| </p> |
| <pre class="programlisting"> |
| |
| |
| /* Demonstrate conversions between a local time and utc |
| * Output: |
| * |
| * UTC <--> New York while DST is NOT active (5 hours) |
| * 2001-Dec-31 19:00:00 in New York is 2002-Jan-01 00:00:00 UTC time |
| * 2002-Jan-01 00:00:00 UTC is 2001-Dec-31 19:00:00 New York time |
| * |
| * UTC <--> New York while DST is active (4 hours) |
| * 2002-May-31 20:00:00 in New York is 2002-Jun-01 00:00:00 UTC time |
| * 2002-Jun-01 00:00:00 UTC is 2002-May-31 20:00:00 New York time |
| * |
| * UTC <--> Arizona (7 hours) |
| * 2002-May-31 17:00:00 in Arizona is 2002-Jun-01 00:00:00 UTC time |
| */ |
| |
| #include "boost/date_time/posix_time/posix_time.hpp" |
| #include "boost/date_time/local_time_adjustor.hpp" |
| #include "boost/date_time/c_local_time_adjustor.hpp" |
| #include <iostream> |
| |
| int |
| main() |
| { |
| using namespace boost::posix_time; |
| using namespace boost::gregorian; |
| |
| //This local adjustor depends on the machine TZ settings-- highly dangerous! |
| typedef boost::date_time::c_local_adjustor<ptime> local_adj; |
| ptime t10(date(2002,Jan,1), hours(7)); |
| ptime t11 = local_adj::utc_to_local(t10); |
| std::cout << "UTC <--> Zone base on TZ setting" << std::endl; |
| std::cout << to_simple_string(t11) << " in your TZ is " |
| << to_simple_string(t10) << " UTC time " |
| << std::endl; |
| time_duration td = t11 - t10; |
| std::cout << "A difference of: " |
| << to_simple_string(td) << std::endl; |
| |
| |
| //eastern timezone is utc-5 |
| typedef boost::date_time::local_adjustor<ptime, -5, us_dst> us_eastern; |
| |
| ptime t1(date(2001,Dec,31), hours(19)); //5 hours b/f midnight NY time |
| |
| std::cout << "\nUTC <--> New York while DST is NOT active (5 hours)" |
| << std::endl; |
| ptime t2 = us_eastern::local_to_utc(t1); |
| std::cout << to_simple_string(t1) << " in New York is " |
| << to_simple_string(t2) << " UTC time " |
| << std::endl; |
| |
| ptime t3 = us_eastern::utc_to_local(t2);//back should be the same |
| std::cout << to_simple_string(t2) << " UTC is " |
| << to_simple_string(t3) << " New York time " |
| << "\n\n"; |
| |
| ptime t4(date(2002,May,31), hours(20)); //4 hours b/f midnight NY time |
| std::cout << "UTC <--> New York while DST is active (4 hours)" << std::endl; |
| ptime t5 = us_eastern::local_to_utc(t4); |
| std::cout << to_simple_string(t4) << " in New York is " |
| << to_simple_string(t5) << " UTC time " |
| << std::endl; |
| |
| ptime t6 = us_eastern::utc_to_local(t5);//back should be the same |
| std::cout << to_simple_string(t5) << " UTC is " |
| << to_simple_string(t6) << " New York time " |
| << "\n" << std::endl; |
| |
| |
| //Arizona timezone is utc-7 with no dst |
| typedef boost::date_time::local_adjustor<ptime, -7, no_dst> us_arizona; |
| |
| ptime t7(date(2002,May,31), hours(17)); |
| std::cout << "UTC <--> Arizona (7 hours)" << std::endl; |
| ptime t8 = us_arizona::local_to_utc(t7); |
| std::cout << to_simple_string(t7) << " in Arizona is " |
| << to_simple_string(t8) << " UTC time " |
| << std::endl; |
| |
| return 0; |
| } |
| |
| |
| </pre> |
| </div> |
| <div class="section"> |
| <div class="titlepage"><div><div><h3 class="title"> |
| <a name="date_time.examples.time_periods"></a>Time Periods</h3></div></div></div> |
| <p> |
| Demonstrate some simple uses of time periods. |
| </p> |
| <pre class="programlisting"> |
| |
| |
| /* Some simple examples of constructing and calculating with times |
| * Returns: |
| * [2002-Feb-01 00:00:00/2002-Feb-01 23:59:59.999999999] |
| * contains 2002-Feb-01 03:00:05 |
| * [2002-Feb-01 00:00:00/2002-Feb-01 23:59:59.999999999] |
| * intersected with |
| * [2002-Feb-01 00:00:00/2002-Feb-01 03:00:04.999999999] |
| * is |
| * [2002-Feb-01 00:00:00/2002-Feb-01 03:00:04.999999999] |
| */ |
| |
| #include "boost/date_time/posix_time/posix_time.hpp" |
| #include <iostream> |
| |
| using namespace boost::posix_time; |
| using namespace boost::gregorian; |
| |
| //Create a simple period class to contain all the times in a day |
| class day_period : public time_period |
| { |
| public: |
| day_period(date d) : time_period(ptime(d),//midnight |
| ptime(d,hours(24))) |
| {} |
| |
| }; |
| |
| int |
| main() |
| { |
| |
| date d(2002,Feb,1); //an arbitrary date |
| //a period that represents a day |
| day_period dp(d); |
| ptime t(d, hours(3)+seconds(5)); //an arbitray time on that day |
| if (dp.contains(t)) { |
| std::cout << to_simple_string(dp) << " contains " |
| << to_simple_string(t) << std::endl; |
| } |
| //a period that represents part of the day |
| time_period part_of_day(ptime(d, hours(0)), t); |
| //intersect the 2 periods and print the results |
| if (part_of_day.intersects(dp)) { |
| time_period result = part_of_day.intersection(dp); |
| std::cout << to_simple_string(dp) << " intersected with\n" |
| << to_simple_string(part_of_day) << " is \n" |
| << to_simple_string(result) << std::endl; |
| } |
| |
| |
| return 0; |
| } |
| |
| |
| </pre> |
| </div> |
| <div class="section"> |
| <div class="titlepage"><div><div><h3 class="title"> |
| <a name="date_time.examples.simple_time_zone"></a>Simple Time Zones</h3></div></div></div> |
| <p> |
| Example usage of custom_time_zone as well as posix_time_zone. |
| </p> |
| <pre class="programlisting"> |
| |
| /* A simple example for using a custom_time_zone and a posix_time_zone. |
| */ |
| |
| #include "boost/date_time/local_time/local_time.hpp" |
| #include <iostream> |
| |
| int |
| main() |
| { |
| using namespace boost; |
| using namespace local_time; |
| using namespace gregorian; |
| using posix_time::time_duration; |
| |
| /***** custom_time_zone *****/ |
| |
| // create the dependent objects for a custom_time_zone |
| time_zone_names tzn("Eastern Standard Time", "EST", |
| "Eastern Daylight Time", "EDT"); |
| time_duration utc_offset(-5,0,0); |
| dst_adjustment_offsets adj_offsets(time_duration(1,0,0), |
| time_duration(2,0,0), |
| time_duration(2,0,0)); |
| // rules for this zone are: |
| // start on first Sunday of April at 2 am |
| // end on last Sunday of October at 2 am |
| // so we use a first_last_dst_rule |
| first_day_of_the_week_in_month start_rule(Sunday, Apr); |
| last_day_of_the_week_in_month end_rule(Sunday, Oct); |
| shared_ptr<dst_calc_rule> nyc_rules(new first_last_dst_rule(start_rule, |
| end_rule)); |
| // create more dependent objects for a non-dst custom_time_zone |
| time_zone_names tzn2("Mountain Standard Time", "MST", |
| "", ""); // no dst means empty dst strings |
| time_duration utc_offset2(-7,0,0); |
| dst_adjustment_offsets adj_offsets2(time_duration(0,0,0), |
| time_duration(0,0,0), |
| time_duration(0,0,0)); |
| // no dst means we need a null pointer to the rules |
| shared_ptr<dst_calc_rule> phx_rules; |
| |
| // create the custom_time_zones |
| time_zone_ptr nyc_1(new custom_time_zone(tzn, utc_offset, |
| adj_offsets, nyc_rules)); |
| time_zone_ptr phx_1(new custom_time_zone(tzn2, utc_offset2, |
| adj_offsets2, phx_rules)); |
| |
| /***** posix_time_zone *****/ |
| |
| // create posix_time_zones that are the duplicates of the |
| // custom_time_zones created above. See posix_time_zone documentation |
| // for details on full zone names. |
| std::string nyc_string, phx_string; |
| nyc_string = "EST-05:00:00EDT+01:00:00,M4.1.0/02:00:00,M10.5.0/02:00:00"; |
| // nyc_string = "EST-05EDT,M4.1.0,M10.5.0"; // shorter when defaults used |
| phx_string = "MST-07"; // no-dst |
| time_zone_ptr nyc_2(new posix_time_zone(nyc_string)); |
| time_zone_ptr phx_2(new posix_time_zone(phx_string)); |
| |
| |
| /***** show the sets are equal *****/ |
| |
| std::cout << "The first zone is in daylight savings from:\n " |
| << nyc_1->dst_local_start_time(2004) << " through " |
| << nyc_1->dst_local_end_time(2004) << std::endl; |
| |
| std::cout << "The second zone is in daylight savings from:\n " |
| << nyc_2->dst_local_start_time(2004) << " through " |
| << nyc_2->dst_local_end_time(2004) << std::endl; |
| |
| std::cout << "The third zone (no daylight savings):\n " |
| << phx_1->std_zone_abbrev() << " and " |
| << phx_1->base_utc_offset() << std::endl; |
| |
| std::cout << "The fourth zone (no daylight savings):\n " |
| << phx_2->std_zone_abbrev() << " and " |
| << phx_2->base_utc_offset() << std::endl; |
| |
| return 0; |
| } |
| |
| </pre> |
| </div> |
| <div class="section"> |
| <div class="titlepage"><div><div><h3 class="title"> |
| <a name="date_time.examples.calc_rules"></a>Daylight Savings Calc Rules</h3></div></div></div> |
| <p> |
| Example of creating various Daylight Savings Calc Rule objects. |
| </p> |
| <pre class="programlisting"> |
| |
| /* A simple example for creating various dst_calc_rule instances |
| */ |
| |
| #include "boost/date_time/gregorian/gregorian.hpp" |
| #include "boost/date_time/local_time/local_time.hpp" |
| #include <iostream> |
| |
| int |
| main() |
| { |
| using namespace boost; |
| using namespace local_time; |
| using namespace gregorian; |
| |
| /***** create the necessary date_generator objects *****/ |
| // starting generators |
| first_day_of_the_week_in_month fd_start(Sunday, May); |
| last_day_of_the_week_in_month ld_start(Sunday, May); |
| nth_day_of_the_week_in_month nkd_start(nth_day_of_the_week_in_month::third, |
| Sunday, May); |
| partial_date pd_start(1, May); |
| // ending generators |
| first_day_of_the_week_in_month fd_end(Sunday, Oct); |
| last_day_of_the_week_in_month ld_end(Sunday, Oct); |
| nth_day_of_the_week_in_month nkd_end(nth_day_of_the_week_in_month::third, |
| Sunday, Oct); |
| partial_date pd_end(31, Oct); |
| |
| /***** create the various dst_calc_rule objects *****/ |
| dst_calc_rule_ptr pdr(new partial_date_dst_rule(pd_start, pd_end)); |
| dst_calc_rule_ptr flr(new first_last_dst_rule(fd_start, ld_end)); |
| dst_calc_rule_ptr llr(new last_last_dst_rule(ld_start, ld_end)); |
| dst_calc_rule_ptr nlr(new nth_last_dst_rule(nkd_start, ld_end)); |
| dst_calc_rule_ptr ndr(new nth_day_of_the_week_in_month_dst_rule(nkd_start, |
| nkd_end)); |
| |
| return 0; |
| } |
| |
| |
| </pre> |
| </div> |
| <div class="section"> |
| <div class="titlepage"><div><div><h3 class="title"> |
| <a name="date_time.examples.flight"></a>Flight Time Example</h3></div></div></div> |
| <p>This example shows a program that calculates the arrival time of a plane that flys from Phoenix to New York. During the flight New York shifts into daylight savings time (Phoenix doesn't because Arizona doesn't use dst).</p> |
| <pre class="programlisting"> |
| <code class="literal"> |
| <span class="preprocessor">#include</span><span class="string"> "boost/date_time/local_time/local_time.hpp"</span><span class="preprocessor"> |
| #include</span><span class="special"> <</span><span class="identifier">iostream</span><span class="special">></span><span class="comment"> |
| |
| /* This example shows a program that calculates the arrival time of a plane |
| * that flys from Phoenix to New York. During the flight New York shifts |
| * into daylight savings time (Phoenix doesn't because Arizona doesn't use |
| * dst). |
| * |
| * |
| */</span><span class="keyword"> |
| |
| int</span><span class="identifier"> main</span><span class="special">()</span><span class="special"> |
| {</span><span class="keyword"> |
| using</span><span class="keyword"> namespace</span><span class="identifier"> boost</span><span class="special">::</span><span class="identifier">gregorian</span><span class="special">;</span><span class="keyword"> |
| using</span><span class="keyword"> namespace</span><span class="identifier"> boost</span><span class="special">::</span><span class="identifier">local_time</span><span class="special">;</span><span class="keyword"> |
| using</span><span class="keyword"> namespace</span><span class="identifier"> boost</span><span class="special">::</span><span class="identifier">posix_time</span><span class="special">;</span><span class="comment"> |
| |
| |
| //setup some timezones for creating and adjusting local times |
| //This user editable file can be found in libs/date_time/data. |
| </span><span class="identifier"> tz_database</span><span class="identifier"> tz_db</span><span class="special">;</span><span class="identifier"> |
| tz_db</span><span class="special">.</span><span class="identifier">load_from_file</span><span class="special">(</span><span class="string">"date_time_zonespec.csv"</span><span class="special">);</span><span class="identifier"> |
| time_zone_ptr</span><span class="identifier"> nyc_tz</span><span class="special"> =</span><span class="identifier"> tz_db</span><span class="special">.</span><span class="identifier">time_zone_from_region</span><span class="special">(</span><span class="string">"America/New_York"</span><span class="special">);</span><span class="comment"> |
| //Use a |
| </span><span class="identifier"> time_zone_ptr</span><span class="identifier"> phx_tz</span><span class="special">(</span><span class="keyword">new</span><span class="identifier"> posix_time_zone</span><span class="special">(</span><span class="string">"MST-07:00:00"</span><span class="special">));</span><span class="comment"> |
| |
| //local departure time in phoenix is 11 pm on april 2 2005 |
| // (ny changes to dst on apr 3 at 2 am) |
| </span><span class="identifier"> local_date_time</span><span class="identifier"> phx_departure</span><span class="special">(</span><span class="identifier">date</span><span class="special">(</span><span class="number">2005</span><span class="special">,</span><span class="identifier"> Apr</span><span class="special">,</span><span class="number"> 2</span><span class="special">),</span><span class="identifier"> hours</span><span class="special">(</span><span class="number">23</span><span class="special">),</span><span class="identifier"> |
| phx_tz</span><span class="special">,</span><span class="identifier"> |
| local_date_time</span><span class="special">::</span><span class="identifier">NOT_DATE_TIME_ON_ERROR</span><span class="special">);</span><span class="identifier"> |
| |
| time_duration</span><span class="identifier"> flight_length</span><span class="special"> =</span><span class="identifier"> hours</span><span class="special">(</span><span class="number">4</span><span class="special">)</span><span class="special"> +</span><span class="identifier"> minutes</span><span class="special">(</span><span class="number">30</span><span class="special">);</span><span class="identifier"> |
| local_date_time</span><span class="identifier"> phx_arrival</span><span class="special"> =</span><span class="identifier"> phx_departure</span><span class="special"> +</span><span class="identifier"> flight_length</span><span class="special">;</span><span class="identifier"> |
| local_date_time</span><span class="identifier"> nyc_arrival</span><span class="special"> =</span><span class="identifier"> phx_arrival</span><span class="special">.</span><span class="identifier">local_time_in</span><span class="special">(</span><span class="identifier">nyc_tz</span><span class="special">);</span><span class="identifier"> |
| |
| std</span><span class="special">::</span><span class="identifier">cout</span><span class="special"> <<</span><span class="string"> "departure phx time: "</span><span class="special"> <<</span><span class="identifier"> phx_departure</span><span class="special"> <<</span><span class="identifier"> std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span><span class="identifier"> |
| std</span><span class="special">::</span><span class="identifier">cout</span><span class="special"> <<</span><span class="string"> "arrival phx time: "</span><span class="special"> <<</span><span class="identifier"> phx_arrival</span><span class="special"> <<</span><span class="identifier"> std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span><span class="identifier"> |
| std</span><span class="special">::</span><span class="identifier">cout</span><span class="special"> <<</span><span class="string"> "arrival nyc time: "</span><span class="special"> <<</span><span class="identifier"> nyc_arrival</span><span class="special"> <<</span><span class="identifier"> std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span><span class="special"> |
| |
| }</span> |
| </code> |
| </pre> |
| </div> |
| <div class="section"> |
| <div class="titlepage"><div><div><h3 class="title"> |
| <a name="date_time.examples.seconds_since_epoch"></a>Seconds Since Epoch</h3></div></div></div> |
| <p> |
| Example of calculating seconds elapsed since epoch (1970-Jan-1) using local_date_time. |
| </p> |
| <pre class="programlisting"> |
| |
| /* This example demonstrates the use of the time zone database and |
| * local time to calculate the number of seconds since the UTC |
| * time_t epoch 1970-01-01 00:00:00. Note that the selected timezone |
| * could be any timezone supported in the time zone database file which |
| * can be modified and updated as needed by the user. |
| * |
| * To solve this problem the following steps are required: |
| * 1) Get a timezone from the tz database for the local time |
| * 2) Construct a local time using the timezone |
| * 3) Construct a posix_time::ptime for the time_t epoch time |
| * 4) Convert the local_time to utc and subtract the epoch time |
| * |
| */ |
| |
| #include "boost/date_time/local_time/local_time.hpp" |
| #include <iostream> |
| |
| int main() |
| { |
| using namespace boost::gregorian; |
| using namespace boost::local_time; |
| using namespace boost::posix_time; |
| |
| tz_database tz_db; |
| try { |
| tz_db.load_from_file("../data/date_time_zonespec.csv"); |
| }catch(data_not_accessible dna) { |
| std::cerr << "Error with time zone data file: " << dna.what() << std::endl; |
| exit(EXIT_FAILURE); |
| }catch(bad_field_count bfc) { |
| std::cerr << "Error with time zone data file: " << bfc.what() << std::endl; |
| exit(EXIT_FAILURE); |
| } |
| |
| time_zone_ptr nyc_tz = tz_db.time_zone_from_region("America/New_York"); |
| date in_date(2004,10,04); |
| time_duration td(12,14,32); |
| // construct with local time value |
| // create not-a-date-time if invalid (eg: in dst transition) |
| local_date_time nyc_time(in_date, |
| td, |
| nyc_tz, |
| local_date_time::NOT_DATE_TIME_ON_ERROR); |
| |
| std::cout << nyc_time << std::endl; |
| |
| ptime time_t_epoch(date(1970,1,1)); |
| std::cout << time_t_epoch << std::endl; |
| |
| // first convert nyc_time to utc via the utc_time() |
| // call and subtract the ptime. |
| time_duration diff = nyc_time.utc_time() - time_t_epoch; |
| |
| //Expected 1096906472 |
| std::cout << "Seconds diff: " << diff.total_seconds() << std::endl; |
| |
| } |
| |
| </pre> |
| </div> |
| </div> |
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| <td align="right"><div class="copyright-footer">Copyright © 2001-2005 CrystalClear Software, Inc<p>Subject to the Boost Software License, Version 1.0. (See accompanying file |
| <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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