[857] | 1 | #ifndef DATE_TIME_LOCAL_TIMEZONE_DEFS_HPP__
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| 2 | #define DATE_TIME_LOCAL_TIMEZONE_DEFS_HPP__
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| 3 |
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| 4 | /* Copyright (c) 2002,2003 CrystalClear Software, Inc.
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| 5 | * Use, modification and distribution is subject to the
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| 6 | * Boost Software License, Version 1.0. (See accompanying
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| 7 | * file LICENSE-1.0 or http://www.boost.org/LICENSE-1.0)
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| 8 | * Author: Jeff Garland
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| 9 | * $Date: 2003/11/23 03:29:56 $
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| 10 | */
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| 11 |
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| 12 | #include "boost/date_time/dst_rules.hpp"
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| 13 |
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| 14 | namespace boost {
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| 15 | namespace date_time {
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| 16 |
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| 17 | // Configurations for common dst rules cases:
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| 18 | // See http://www.wharton.co.uk/Support/sup_dst.htm for more
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| 19 | // information on how various locales use dst rules
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| 20 |
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| 21 | //! Specification for daylight savings start rules in US
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| 22 | /*! This class is used to configure dst_calc_engine template typically
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| 23 | as follows:
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| 24 | @code
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| 25 | using namespace boost::gregorian;
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| 26 | using namespace boost::posix_time;
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| 27 | typedef us_dst_trait<date> us_dst_traits;
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| 28 | typedef boost::date_time::dst_calc_engine<date, time_duration,
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| 29 | us_dst_traits>
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| 30 | us_dst_calc;
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| 31 | //calculate the 2002 transition day of USA April 7 2002
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| 32 | date dst_start = us_dst_calc::local_dst_start_day(2002);
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| 33 |
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| 34 | //calculate the 2002 transition day of USA Oct 27 2002
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| 35 | date dst_end = us_dst_calc::local_dst_end_day(2002);
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| 36 |
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| 37 | //check if a local time is in dst or not -- posible answers
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| 38 | //are yes, no, invalid time label, ambiguous
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| 39 | ptime t(...some time...);
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| 40 | if (us_dst::local_is_dst(t.date(), t.time_of_day())
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| 41 | == boost::date_time::is_not_in_dst)
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| 42 | {
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| 43 |
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| 44 | }
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| 45 |
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| 46 | @endcode
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| 47 | This generates a type suitable for the calculation of dst
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| 48 | transitions for the United States. Of course other templates
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| 49 | can be used for other locales.
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| 50 |
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| 51 | */
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| 52 |
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| 53 | template<class date_type>
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| 54 | struct us_dst_trait
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| 55 | {
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| 56 | typedef typename date_type::day_of_week_type day_of_week_type;
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| 57 | typedef typename date_type::month_type month_type;
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| 58 | typedef date_time::first_kday_of_month<date_type> start_rule_functor;
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| 59 | typedef date_time::last_kday_of_month<date_type> end_rule_functor;
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| 60 | static day_of_week_type start_day() {return Sunday;}
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| 61 | static month_type start_month() {return Apr;}
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| 62 | static day_of_week_type end_day() {return Sunday;}
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| 63 | static month_type end_month() {return Oct;}
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| 64 | static int dst_start_offset_minutes() { return 120;}
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| 65 | static int dst_end_offset_minutes() { return 120; }
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| 66 | static int dst_shift_length_minutes() { return 60; }
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| 67 | };
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| 68 |
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| 69 | //!Rules for daylight savings start in the EU (Last Sun in Mar)
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| 70 | /*!These amount to the following:
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| 71 | - Start of dst day is last Sunday in March
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| 72 | - End day of dst is last Sunday in Oct
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| 73 | - Going forward switch time is 2:00 am (offset 120 minutes)
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| 74 | - Going back switch time is 3:00 am (off set 180 minutes)
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| 75 | - Shift duration is one hour (60 minutes)
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| 76 | */
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| 77 | template<class date_type>
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| 78 | struct eu_dst_trait
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| 79 | {
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| 80 | typedef typename date_type::day_of_week_type day_of_week_type;
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| 81 | typedef typename date_type::month_type month_type;
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| 82 | typedef date_time::last_kday_of_month<date_type> start_rule_functor;
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| 83 | typedef date_time::last_kday_of_month<date_type> end_rule_functor;
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| 84 | static day_of_week_type start_day() {return Sunday;}
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| 85 | static month_type start_month() {return Mar;}
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| 86 | static day_of_week_type end_day() {return Sunday;}
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| 87 | static month_type end_month() {return Oct;}
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| 88 | static int dst_start_offset_minutes() { return 120;}
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| 89 | static int dst_end_offset_minutes() { return 180; }
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| 90 | static int dst_shift_length_minutes() { return 60; }
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| 91 | };
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| 92 |
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| 93 | //! Alternative dst traits for some parts of the United Kingdom
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| 94 | /* Several places in the UK use EU start and end rules for the
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| 95 | day, but different local conversion times (eg: forward change at 1:00
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| 96 | am local and backward change at 2:00 am dst instead of 2:00am
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| 97 | forward and 3:00am back for the EU).
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| 98 | */
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| 99 | template<class date_type>
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| 100 | struct uk_dst_trait : public eu_dst_trait<date_type>
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| 101 | {
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| 102 | static int dst_start_offset_minutes() { return 60;}
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| 103 | static int dst_end_offset_minutes() { return 120; }
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| 104 | static int dst_shift_length_minutes() { return 60; }
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| 105 | };
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| 106 |
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| 107 | //Rules for Adelaide Australia
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| 108 | template<class date_type>
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| 109 | struct acst_dst_trait
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| 110 | {
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| 111 | typedef typename date_type::day_of_week_type day_of_week_type;
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| 112 | typedef typename date_type::month_type month_type;
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| 113 | typedef date_time::last_kday_of_month<date_type> start_rule_functor;
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| 114 | typedef date_time::last_kday_of_month<date_type> end_rule_functor;
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| 115 | static day_of_week_type start_day() {return Sunday;}
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| 116 | static month_type start_month() {return Oct;}
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| 117 | static day_of_week_type end_day() {return Sunday;}
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| 118 | static month_type end_month() {return Mar;}
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| 119 | static int dst_start_offset_minutes() { return 120;}
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| 120 | static int dst_end_offset_minutes() { return 120; }
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| 121 | static int dst_shift_length_minutes() { return 60; }
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| 122 | };
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| 123 |
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| 124 |
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| 125 |
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| 126 |
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| 127 |
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| 128 |
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| 129 | } } //namespace boost::date_time
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| 130 |
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| 131 |
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| 132 | #endif
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