Index: wp-settings.php
===================================================================
--- wp-settings.php	(revision 12021)
+++ wp-settings.php	(working copy)
@@ -18,6 +18,9 @@
 set_magic_quotes_runtime(0);
 @ini_set('magic_quotes_sybase', 0);
 
+if ( function_exists('date_default_timezone_set') && !ini_get('date.timezone') )
+	date_default_timezone_set('UTC');
+
 /**
  * Turn register globals off.
  *