diff --git a/include/boost/date_time/local_timezone_defs.hpp b/include/boost/date_time/local_timezone_defs.hpp new file mode 100644 index 0000000..0f8b369 --- /dev/null +++ b/include/boost/date_time/local_timezone_defs.hpp @@ -0,0 +1,140 @@ +#ifndef DATE_TIME_LOCAL_TIMEZONE_DEFS_HPP__ +#define DATE_TIME_LOCAL_TIMEZONE_DEFS_HPP__ +/* Copyright (c) 2002 CrystalClear Software, Inc. + * Disclaimer & Full Copyright at end of file + * Author: Jeff Garland + */ + +#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 us_dst_traits; + typedef boost::date_time::dst_calc_engine + 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 + 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 date_time::first_kday_of_month start_rule_functor; + typedef date_time::last_kday_of_month end_rule_functor; + static day_of_week_type start_day() {return Sunday;} + static month_type start_month() {return Apr;} + static day_of_week_type end_day() {return Sunday;} + static month_type end_month() {return Oct;} + 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 + 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 date_time::last_kday_of_month start_rule_functor; + typedef date_time::last_kday_of_month end_rule_functor; + static day_of_week_type start_day() {return Sunday;} + static month_type start_month() {return Mar;} + static day_of_week_type end_day() {return Sunday;} + static month_type end_month() {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; } + }; + + //! 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 + struct uk_dst_trait : public eu_dst_trait + { + 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 + 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 date_time::last_kday_of_month start_rule_functor; + typedef date_time::last_kday_of_month end_rule_functor; + static day_of_week_type start_day() {return Sunday;} + static month_type start_month() {return Oct;} + static day_of_week_type end_day() {return Sunday;} + static month_type end_month() {return Mar;} + static int dst_start_offset_minutes() { return 120;} + static int dst_end_offset_minutes() { return 120; } + static int dst_shift_length_minutes() { return 60; } + }; + + + + + + +} } //namespace boost::date_time + +/* Copyright (c) 2002 + * CrystalClear Software, Inc. + * + * Permission to use, copy, modify, distribute and sell this software + * and its documentation for any purpose is hereby granted without fee, + * provided that the above copyright notice appear in all copies and + * that both that copyright notice and this permission notice appear + * in supporting documentation. CrystalClear Software makes no + * representations about the suitability of this software for any + * purpose. It is provided "as is" without express or implied warranty. + * + */ + +#endif