Index: boost/date_time/time_facet.hpp
===================================================================
--- boost/date_time/time_facet.hpp	(revision 78316)
+++ boost/date_time/time_facet.hpp	(working copy)
@@ -801,6 +801,7 @@
         char_type c = '\0';
         if((sitr != stream_end) && (*sitr == '-' || *sitr == '+')) {
           c = *sitr;
+          ++sitr;
         }
 
         typedef typename time_duration_type::hour_type hour_type;
@@ -921,6 +922,8 @@
         }
 
         td = time_duration_type(hour, min, sec, frac);
+        if (c == '-')
+          td = td.invert_sign();
         return sitr;
       }
 
@@ -1364,4 +1367,3 @@
 
 
 #endif
-