#define DATE_TIME_DST_RULES_HPP__
/* Copyright (c) 2002,2003, 2007 CrystalClear Software, Inc.
- * Use, modification and distribution is subject to the
+ * 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, Bart Garst
namespace boost {
namespace date_time {
- enum time_is_dst_result {is_not_in_dst, is_in_dst,
+ enum time_is_dst_result {is_not_in_dst, is_in_dst,
ambiguous, invalid_time_label};
//! Dynamic class used to caluclate dst transition information
- template<class date_type_,
+ template<class date_type_,
class time_duration_type_>
class dst_calculator
{
//! Check the local time offset when on dst start day
/*! On this dst transition, the time label between
* the transition boundary and the boudary + the offset
- * are invalid times. If before the boundary then still
- * not in dst.
+ * are invalid times. If before the boundary then still
+ * not in dst.
*@param time_of_day Time offset in the day for the local time
*@param dst_start_offset_minutes Local day offset for start of dst
*@param dst_length_minutes Number of minutes to adjust clock forward
*@retval status of time label w.r.t. dst
*/
- static time_is_dst_result
+ static time_is_dst_result
process_local_dst_start_day(const time_duration_type& time_of_day,
unsigned int dst_start_offset_minutes,
long dst_length_minutes)
if (time_of_day >= time_duration_type(0,offset,0)) {
return is_in_dst;
}
- return invalid_time_label;
+ return invalid_time_label;
}
//! Check the local time offset when on the last day of dst
/*! This is the calculation for the DST end day. On that day times
- * prior to the conversion time - dst_length (1 am in US) are still
- * in dst. Times between the above and the switch time are
+ * prior to the conversion time - dst_length (1 am in US) are still
+ * in dst. Times between the above and the switch time are
* ambiguous. Times after the start_offset are not in dst.
*@param time_of_day Time offset in the day for the local time
*@param dst_end_offset_minutes Local time of day for end of dst
*@retval status of time label w.r.t. dst
*/
- static time_is_dst_result
+ static time_is_dst_result
process_local_dst_end_day(const time_duration_type& time_of_day,
unsigned int dst_end_offset_minutes,
long dst_length_minutes)
}
//! Calculates if the given local time is dst or not
- /*! Determines if the time is really in DST or not. Also checks for
+ /*! Determines if the time is really in DST or not. Also checks for
* invalid and ambiguous.
* @param current_day The day to check for dst
- * @param time_of_day Time offset within the day to check
+ * @param time_of_day Time offset within the day to check
* @param dst_start_day Starting day of dst for the given locality
* @param dst_start_offset Time offset within day for dst boundary
* @param dst_end_day Ending day of dst for the given locality
* @param dst_length_minutes length of dst adjusment
* @retval The time is either ambiguous, invalid, in dst, or not in dst
*/
- static time_is_dst_result
+ static time_is_dst_result
local_is_dst(const date_type& current_day,
const time_duration_type& time_of_day,
const date_type& dst_start_day,
}
//! Calculates if the given local time is dst or not
- /*! Determines if the time is really in DST or not. Also checks for
+ /*! Determines if the time is really in DST or not. Also checks for
* invalid and ambiguous.
* @param current_day The day to check for dst
- * @param time_of_day Time offset within the day to check
+ * @param time_of_day Time offset within the day to check
* @param dst_start_day Starting day of dst for the given locality
- * @param dst_start_offset_minutes Offset within day for dst
+ * @param dst_start_offset_minutes Offset within day for dst
* boundary (eg 120 for US which is 02:00:00)
* @param dst_end_day Ending day of dst for the given locality
- * @param dst_end_offset_minutes Offset within day given in dst for dst
+ * @param dst_end_offset_minutes Offset within day given in dst for dst
* boundary (eg 120 for US which is 02:00:00)
* @param dst_length_minutes Length of dst adjusment (eg: 60 for US)
* @retval The time is either ambiguous, invalid, in dst, or not in dst
*/
- static time_is_dst_result
+ static time_is_dst_result
local_is_dst(const date_type& current_day,
const time_duration_type& time_of_day,
const date_type& dst_start_day,
dst_start_offset_minutes,
dst_length_minutes);
}
-
+
if (current_day == dst_end_day) {
return process_local_dst_end_day(time_of_day,
dst_end_offset_minutes,
* calculation at compile time covering all the cases. Unfortunately
* because of the number of dimensions related to daylight savings
* calculation the number of parameters is high. In addition, the
- * start and end transition rules are complex types that specify
+ * start and end transition rules are complex types that specify
* an algorithm for calculation of the starting day and ending
- * day of daylight savings time including the month and day
+ * day of daylight savings time including the month and day
* specifications (eg: last sunday in October).
*
* @param date_type A type that represents dates, typically gregorian::date
* @param time_duration_type Used for the offset in the day calculations
- * @param dst_traits A set of traits that define the rules of dst
+ * @param dst_traits A set of traits that define the rules of dst
* calculation. The dst_trait must include the following:
* start_rule_functor - Rule to calculate the starting date of a
* dst transition (eg: last_kday_of_month).
- * start_day - static function that returns month of dst start for
+ * start_day - static function that returns month of dst start for
* start_rule_functor
- * start_month -static function that returns day or day of week for
+ * start_month -static function that returns day or day of week for
* dst start of dst
* end_rule_functor - Rule to calculate the end of dst day.
* end_day - static fucntion that returns end day for end_rule_functor
* end_month - static function that returns end month for end_rule_functor
* dst_start_offset_minutes - number of minutes from start of day to transition to dst -- 120 (or 2:00 am) is typical for the U.S. and E.U.
- * dst_start_offset_minutes - number of minutes from start of day to transition off of dst -- 180 (or 3:00 am) is typical for E.U.
+ * dst_start_offset_minutes - number of minutes from start of day to transition off of dst -- 180 (or 3:00 am) is typical for E.U.
* dst_length_minutes - number of minutes that dst shifts clock
*/
- template<class date_type,
+ template<class date_type,
class time_duration_type,
class dst_traits>
class dst_calc_engine
typedef dst_calculator<date_type, time_duration_type> dstcalc;
//! Calculates if the given local time is dst or not
- /*! Determines if the time is really in DST or not. Also checks for
+ /*! Determines if the time is really in DST or not. Also checks for
* invalid and ambiguous.
* @retval The time is either ambiguous, invalid, in dst, or not in dst
*/
static time_is_dst_result local_is_dst(const date_type& d,
- const time_duration_type& td)
+ const time_duration_type& td)
{
year_type y = d.year();
return dstcalc::local_is_dst(d,td,
dst_start,
dst_traits::dst_start_offset_minutes(),
- dst_end,
- dst_traits::dst_end_offset_minutes(),
+ dst_end,
+ dst_traits::dst_end_offset_minutes(),
dst_traits::dst_shift_length_minutes());
-
+
}
static bool is_dst_boundary_day(date_type d)
}
//! The time of day for the dst transition (eg: typically 01:00:00 or 02:00:00)
- static time_duration_type dst_offset()
+ static time_duration_type dst_offset()
{
return time_duration_type(0,dst_traits::dst_shift_length_minutes(),0);
}
static date_type local_dst_start_day(year_type year)
{
- return dst_traits::local_dst_start_day(year);
+ return dst_traits::local_dst_start_day(year);
}
static date_type local_dst_end_day(year_type year)
* In 2007 US/Canada DST rules changed
* (http://en.wikipedia.org/wiki/Energy_Policy_Act_of_2005#Change_to_daylight_saving_time).
*/
- template<class date_type_,
+ template<class date_type_,
class time_duration_type_,
- unsigned int dst_start_offset_minutes=120, //from start of day
+ unsigned int dst_start_offset_minutes=120, //from start of day
short dst_length_minutes=60> //1 hour == 60 min in US
- class us_dst_rules
+ class us_dst_rules
{
public:
typedef time_duration_type_ time_duration_type;
typedef dst_calculator<date_type, time_duration_type> dstcalc;
//! Calculates if the given local time is dst or not
- /*! Determines if the time is really in DST or not. Also checks for
+ /*! Determines if the time is really in DST or not. Also checks for
* invalid and ambiguous.
* @retval The time is either ambiguous, invalid, in dst, or not in dst
*/
static time_is_dst_result local_is_dst(const date_type& d,
- const time_duration_type& td)
+ const time_duration_type& td)
{
year_type y = d.year();
date_type dst_end = local_dst_end_day(y);
return dstcalc::local_is_dst(d,td,
dst_start,dst_start_offset_minutes,
- dst_end, dst_start_offset_minutes,
+ dst_end, dst_start_offset_minutes,
dst_length_minutes);
-
+
}
{
if (year >= year_type(2007)) {
//second sunday in march
- nkday ssim(nkday::second, Sunday, gregorian::Mar);
- return ssim.get_date(year);
+ nkday ssim(nkday::second, Sunday, date_time::Mar);
+ return ssim.get_date(year);
} else {
//first sunday in april
- fkday fsia(Sunday, gregorian::Apr);
- return fsia.get_date(year);
+ fkday fsia(Sunday, date_time::Apr);
+ return fsia.get_date(year);
}
}
{
if (year >= year_type(2007)) {
//first sunday in november
- fkday fsin(Sunday, gregorian::Nov);
- return fsin.get_date(year);
+ fkday fsin(Sunday, date_time::Nov);
+ return fsin.get_date(year);
} else {
//last sunday in october
- lkday lsio(Sunday, gregorian::Oct);
+ lkday lsio(Sunday, date_time::Oct);
return lsio.get_date(year);
}
}
//! Calculates if the given local time is dst or not
/*! @retval Always is_not_in_dst since this is for zones without dst
*/
- static time_is_dst_result local_is_dst(const date_type&,
- const time_duration_type&)
+ static time_is_dst_result local_is_dst(const date_type&,
+ const time_duration_type&)
{
return is_not_in_dst;
}
-
+
//! Calculates if the given utc time is in dst
- static time_is_dst_result utc_is_dst(const date_type&,
- const time_duration_type&)
+ static time_is_dst_result utc_is_dst(const date_type&,
+ const time_duration_type&)
{
return is_not_in_dst;
}
return false;
}
- static time_duration_type dst_offset()
+ static time_duration_type dst_offset()
{
return time_duration_type(0,0,0);
}
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