diff --git a/Tools/i18n/pygettext.py b/Tools/i18n/pygettext.py
index f0488bf..bb0dd35 100755
--- a/Tools/i18n/pygettext.py
+++ b/Tools/i18n/pygettext.py
@@ -445,7 +445,7 @@
 
     def write(self, fp):
         options = self.__options
-        timestamp = time.ctime(time.time())
+        timestamp = time.strftime('%Y-%m-%d %H:%M+%Z')
         # The time stamp in the header doesn't have the same format as that
         # generated by xgettext...
         print >> fp, pot_header % {'time': timestamp, 'version': __version__}