--- boost_1_33_1-prepatch/boost/date_time/dst_rules.hpp	2007-01-12 17:16:50.000000000 +0000
+++ boost_1_33_1/boost/date_time/dst_rules.hpp	2007-01-15 18:23:31.000000000 +0000
@@ -284,6 +284,7 @@
       typedef typename date_type::calendar_type calendar_type;
       typedef date_time::last_kday_of_month<date_type> lkday;
       typedef date_time::first_kday_of_month<date_type> fkday;
+      typedef date_time::nth_kday_of_month<date_type> nkday;
       typedef dst_calculator<date_type, time_duration_type> dstcalc;
 
       //! Calculates if the given local time is dst or not
@@ -315,16 +316,28 @@
 
       static date_type local_dst_start_day(year_type year)
       {
-        //first sunday in april
-        fkday fsia(Sunday, gregorian::Apr);
-        return fsia.get_date(year);      
+        if (year >= year_type(dst_changeover_year)) {
+          //second sunday in march
+          nkday ssim(nkday::second, Sunday, gregorian::Mar);
+          return ssim.get_date(year);      
+        } else {
+          //first sunday in april
+          fkday fsia(Sunday, gregorian::Apr);
+          return fsia.get_date(year);      
+        }
       }
 
       static date_type local_dst_end_day(year_type year)
       {
-        //last sunday in october
-        lkday lsio(Sunday, gregorian::Oct);
-        return lsio.get_date(year);
+        if (year >= year_type(dst_changeover_year)) {
+          //first sunday in november
+          fkday fsin(Sunday, gregorian::Nov);
+          return fsin.get_date(year);      
+        } else {
+          //last sunday in october
+          lkday lsio(Sunday, gregorian::Oct);
+          return lsio.get_date(year);
+        }
       }
 
       static time_duration_type dst_offset()
@@ -332,6 +345,15 @@
         return time_duration_type(0,dst_length_minutes,0);
       }
 
+     private:
+
+      /**
+       * The year when US DST rules changed
+       * (http://en.wikipedia.org/wiki/Energy_Policy_Act_of_2005#Change_to_daylight_saving_time).
+       * This will have to be extended to a set of years if it the
+       * rules change again.
+       */
+      static const int dst_changeover_year = 2007;
 
     };