| #ifndef DATE_TIME_LOCAL_TIMEZONE_DEFS_HPP__ | |
| #define DATE_TIME_LOCAL_TIMEZONE_DEFS_HPP__ | |
| /* Copyright (c) 2002,2003 CrystalClear Software, Inc. | |
| * Use, modification and distribution is subject to the | |
| * Boost Software License, Version 1.0. (See accompanying | |
| * file LICENSE_1_0.txt or http://www.boost.org/LICENSE_1_0.txt) | |
| * Author: Jeff Garland | |
| * $Date: 2008-11-13 15:10:23 -0500 (Thu, 13 Nov 2008) $ | |
| */ | |
| #include "boost/date_time/dst_rules.hpp" | |
| namespace boost { | |
| namespace date_time { | |
| // Configurations for common dst rules cases: | |
| // See http://www.wharton.co.uk/Support/sup_dst.htm for more | |
| // information on how various locales use dst rules | |
| //! Specification for daylight savings start rules in US | |
| /*! This class is used to configure dst_calc_engine template typically | |
| as follows: | |
| @code | |
| using namespace boost::gregorian; | |
| using namespace boost::posix_time; | |
| typedef us_dst_trait<date> us_dst_traits; | |
| typedef boost::date_time::dst_calc_engine<date, time_duration, | |
| us_dst_traits> | |
| us_dst_calc; | |
| //calculate the 2002 transition day of USA April 7 2002 | |
| date dst_start = us_dst_calc::local_dst_start_day(2002); | |
| //calculate the 2002 transition day of USA Oct 27 2002 | |
| date dst_end = us_dst_calc::local_dst_end_day(2002); | |
| //check if a local time is in dst or not -- posible answers | |
| //are yes, no, invalid time label, ambiguous | |
| ptime t(...some time...); | |
| if (us_dst::local_is_dst(t.date(), t.time_of_day()) | |
| == boost::date_time::is_not_in_dst) | |
| { | |
| } | |
| @endcode | |
| This generates a type suitable for the calculation of dst | |
| transitions for the United States. Of course other templates | |
| can be used for other locales. | |
| */ | |
| template<class date_type> | |
| struct us_dst_trait | |
| { | |
| typedef typename date_type::day_of_week_type day_of_week_type; | |
| typedef typename date_type::month_type month_type; | |
| typedef typename date_type::year_type year_type; | |
| typedef date_time::nth_kday_of_month<date_type> start_rule_functor; | |
| typedef date_time::first_kday_of_month<date_type> end_rule_functor; | |
| typedef date_time::first_kday_of_month<date_type> start_rule_functor_pre2007; | |
| typedef date_time::last_kday_of_month<date_type> end_rule_functor_pre2007; | |
| static day_of_week_type start_day(year_type) {return Sunday;} | |
| static month_type start_month(year_type y) | |
| { | |
| if (y < 2007) return Apr; | |
| return Mar; | |
| } | |
| static day_of_week_type end_day(year_type) {return Sunday;} | |
| static month_type end_month(year_type y) | |
| { | |
| if (y < 2007) return Oct; | |
| return Nov; | |
| } | |
| static date_type local_dst_start_day(year_type year) | |
| { | |
| if (year < 2007) { | |
| start_rule_functor_pre2007 start1(start_day(year), | |
| start_month(year)); | |
| return start1.get_date(year); | |
| } | |
| start_rule_functor start(start_rule_functor::second, | |
| start_day(year), | |
| start_month(year)); | |
| return start.get_date(year); | |
| } | |
| static date_type local_dst_end_day(year_type year) | |
| { | |
| if (year < 2007) { | |
| end_rule_functor_pre2007 end_rule(end_day(year), | |
| end_month(year)); | |
| return end_rule.get_date(year); | |
| } | |
| end_rule_functor end(end_day(year), | |
| end_month(year)); | |
| return end.get_date(year); | |
| } | |
| static int dst_start_offset_minutes() { return 120;} | |
| static int dst_end_offset_minutes() { return 120; } | |
| static int dst_shift_length_minutes() { return 60; } | |
| }; | |
| //!Rules for daylight savings start in the EU (Last Sun in Mar) | |
| /*!These amount to the following: | |
| - Start of dst day is last Sunday in March | |
| - End day of dst is last Sunday in Oct | |
| - Going forward switch time is 2:00 am (offset 120 minutes) | |
| - Going back switch time is 3:00 am (off set 180 minutes) | |
| - Shift duration is one hour (60 minutes) | |
| */ | |
| template<class date_type> | |
| struct eu_dst_trait | |
| { | |
| typedef typename date_type::day_of_week_type day_of_week_type; | |
| typedef typename date_type::month_type month_type; | |
| typedef typename date_type::year_type year_type; | |
| typedef date_time::last_kday_of_month<date_type> start_rule_functor; | |
| typedef date_time::last_kday_of_month<date_type> end_rule_functor; | |
| static day_of_week_type start_day(year_type) {return Sunday;} | |
| static month_type start_month(year_type) {return Mar;} | |
| static day_of_week_type end_day(year_type) {return Sunday;} | |
| static month_type end_month(year_type) {return Oct;} | |
| static int dst_start_offset_minutes() { return 120;} | |
| static int dst_end_offset_minutes() { return 180; } | |
| static int dst_shift_length_minutes() { return 60; } | |
| static date_type local_dst_start_day(year_type year) | |
| { | |
| start_rule_functor start(start_day(year), | |
| start_month(year)); | |
| return start.get_date(year); | |
| } | |
| static date_type local_dst_end_day(year_type year) | |
| { | |
| end_rule_functor end(end_day(year), | |
| end_month(year)); | |
| return end.get_date(year); | |
| } | |
| }; | |
| //! Alternative dst traits for some parts of the United Kingdom | |
| /* Several places in the UK use EU start and end rules for the | |
| day, but different local conversion times (eg: forward change at 1:00 | |
| am local and backward change at 2:00 am dst instead of 2:00am | |
| forward and 3:00am back for the EU). | |
| */ | |
| template<class date_type> | |
| struct uk_dst_trait : public eu_dst_trait<date_type> | |
| { | |
| static int dst_start_offset_minutes() { return 60;} | |
| static int dst_end_offset_minutes() { return 120; } | |
| static int dst_shift_length_minutes() { return 60; } | |
| }; | |
| //Rules for Adelaide Australia | |
| template<class date_type> | |
| struct acst_dst_trait | |
| { | |
| typedef typename date_type::day_of_week_type day_of_week_type; | |
| typedef typename date_type::month_type month_type; | |
| typedef typename date_type::year_type year_type; | |
| typedef date_time::last_kday_of_month<date_type> start_rule_functor; | |
| typedef date_time::last_kday_of_month<date_type> end_rule_functor; | |
| static day_of_week_type start_day(year_type) {return Sunday;} | |
| static month_type start_month(year_type) {return Oct;} | |
| static day_of_week_type end_day(year_type) {return Sunday;} | |
| static month_type end_month(year_type) {return Mar;} | |
| static int dst_start_offset_minutes() { return 120;} | |
| static int dst_end_offset_minutes() { return 180; } | |
| static int dst_shift_length_minutes() { return 60; } | |
| static date_type local_dst_start_day(year_type year) | |
| { | |
| start_rule_functor start(start_day(year), | |
| start_month(year)); | |
| return start.get_date(year); | |
| } | |
| static date_type local_dst_end_day(year_type year) | |
| { | |
| end_rule_functor end(end_day(year), | |
| end_month(year)); | |
| return end.get_date(year); | |
| } | |
| }; | |
| } } //namespace boost::date_time | |
| #endif |