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author | Anas Nashif <anas.nashif@intel.com> | 2012-10-30 12:57:26 -0700 |
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committer | Anas Nashif <anas.nashif@intel.com> | 2012-10-30 12:57:26 -0700 |
commit | 1a78a62555be32868418fe52f8e330c9d0f95d5a (patch) | |
tree | d3765a80e7d3b9640ec2e930743630cd6b9fce2b /boost/date_time/local_timezone_defs.hpp | |
download | boost-1a78a62555be32868418fe52f8e330c9d0f95d5a.tar.gz boost-1a78a62555be32868418fe52f8e330c9d0f95d5a.tar.bz2 boost-1a78a62555be32868418fe52f8e330c9d0f95d5a.zip |
Imported Upstream version 1.49.0upstream/1.49.0
Diffstat (limited to 'boost/date_time/local_timezone_defs.hpp')
-rw-r--r-- | boost/date_time/local_timezone_defs.hpp | 193 |
1 files changed, 193 insertions, 0 deletions
diff --git a/boost/date_time/local_timezone_defs.hpp b/boost/date_time/local_timezone_defs.hpp new file mode 100644 index 0000000000..fd6d3c2fab --- /dev/null +++ b/boost/date_time/local_timezone_defs.hpp @@ -0,0 +1,193 @@ +#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 |