--- /dev/null
+#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
+ * $Date$
+ */
+
+#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
projects / ceph.git / blobdiff