Index: posix_time_zone.hpp
===================================================================
--- posix_time_zone.hpp	(revision 82447)
+++ posix_time_zone.hpp	(working copy)
@@ -417,7 +417,7 @@
       unsigned short sm=1;
       int sd=0;
       sd = lexical_cast<int>(s.substr(1)); // skip 'J'
-      while(sd >= calendar::end_of_month_day(year,sm)){
+      while(sd > calendar::end_of_month_day(year,sm)){
         sd -= calendar::end_of_month_day(year,sm++);
       }
       unsigned short em=1;