diff -up Date-Manip-5.54/lib/Date/Manip.pm.orig Date-Manip-5.54/lib/Date/Manip.pm
--- Date-Manip-5.54/lib/Date/Manip.pm.orig	2008-11-26 17:48:15.000000000 +0100
+++ Date-Manip-5.54/lib/Date/Manip.pm	2008-11-26 17:50:10.000000000 +0100
@@ -3569,6 +3569,7 @@ sub Date_TimeZone {
             $tz=$ENV{'SYS$TIMEZONE_DIFFERENTIAL'}/3600.; # e.g. '-4' for EDT
           }
         }
+        push(@tz,$tz)  if (defined $tz);
       } else {
         $tz=`date +%Z 2> /dev/null`;
         chomp($tz);
@@ -3577,8 +3578,13 @@ sub Date_TimeZone {
           chomp($tz);
           $tz=(split(/\s+/,$tz))[4];
         }
+        push(@tz,$tz)  if (defined $tz);
+
+        # for international timezones
+        $tz=`date +%z 2> /dev/null`;
+        chomp($tz);
+        push(@tz,$tz)  if (defined $tz);
       }
-      push(@tz,$tz)  if (defined $tz);
     } else {
       # We need to satisfy taint checking, but also look in all the
       # directories in @DatePath.
@@ -3593,6 +3599,11 @@ sub Date_TimeZone {
 	$tz=(split(/\s+/,$tz))[4];
       }
       push(@tz,$tz)  if (defined $tz);
+
+      # for international timezones
+      $tz=`date +%z 2>  /dev/null`;
+      chomp($tz);
+      push(@tz,$tz)  if (defined $tz);
     }
   }