--- 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 11:18:58.000000000 +0200
@@ -45,6 +45,8 @@
   std::basic_ostream<CharT, TraitsT>&
   operator<<(std::basic_ostream<CharT, TraitsT>& os,
              const ptime& p) {
+    if (os.fail())
+      return os;
     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;
@@ -112,6 +114,8 @@
   std::basic_ostream<CharT, TraitsT>&
   operator<<(std::basic_ostream<CharT, TraitsT>& os,
              const boost::posix_time::time_period& p) {
+    if (os.fail())
+      return os;
     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;
@@ -178,6 +182,8 @@
   std::basic_ostream<CharT, Traits>&
   operator<<(std::basic_ostream<CharT, Traits>& os, const time_duration& td)
   {
+    if (os.fail())
+      return os;
     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;