| #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 |