--- boost_1_43_0-orig/boost/date_time/posix_time/posix_time_io.hpp	2008-11-13 20:05:31.000000000 +0100
+++ boost_1_43_0/boost/date_time/posix_time/posix_time_io.hpp	2010-06-07 11:42:52.000000000 +0200
@@ -45,6 +45,9 @@
   std::basic_ostream<CharT, TraitsT>&
   operator<<(std::basic_ostream<CharT, TraitsT>& os,
              const ptime& p) {
+    typedef std::basic_ostream<CharT, TraitsT>       __ostream_type;
+    typename __ostream_type::sentry cerb(os);
+    if (cerb) {
     boost::io::ios_flags_saver iflags(os);
     typedef boost::date_time::time_facet<ptime, CharT> custom_ptime_facet;
     typedef std::time_put<CharT>                  std_ptime_facet;
@@ -62,6 +65,7 @@
       os.imbue(l);
       f->put(oitr, os, os.fill(), p);
     }
+    }
     return os;
   }
 
@@ -112,6 +116,9 @@
   std::basic_ostream<CharT, TraitsT>&
   operator<<(std::basic_ostream<CharT, TraitsT>& os,
              const boost::posix_time::time_period& p) {
+    typedef std::basic_ostream<CharT, TraitsT>       __ostream_type;
+    typename __ostream_type::sentry cerb(os);
+    if (cerb) {
     boost::io::ios_flags_saver iflags(os);
     typedef boost::date_time::time_facet<ptime, CharT> custom_ptime_facet;
     typedef std::time_put<CharT>                  std_time_facet;
@@ -130,6 +137,7 @@
       os.imbue(l);
       f->put(oitr, os, os.fill(), p);
     }
+    }
     return os;
   }
 
@@ -178,6 +186,9 @@
   std::basic_ostream<CharT, Traits>&
   operator<<(std::basic_ostream<CharT, Traits>& os, const time_duration& td)
   {
+    typedef std::basic_ostream<CharT, Traits>       __ostream_type;
+    typename __ostream_type::sentry cerb(os);
+    if (cerb) {
     boost::io::ios_flags_saver iflags(os);
     typedef boost::date_time::time_facet<ptime, CharT> custom_ptime_facet;
     typedef std::time_put<CharT>                  std_ptime_facet;
@@ -195,6 +206,7 @@
       os.imbue(l);
       f->put(oitr, os, os.fill(), td);
     }
+    }
     return os;
   }