static tz traits

[SVN r17300]

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<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 date_time::first_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() {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<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 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() {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<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 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() {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