diff -r dd8c53454f31 -r 3a791f3f4b91 plugins/yubikey/corelib.php
--- a/plugins/yubikey/corelib.php	Mon May 11 08:50:07 2009 -0400
+++ b/plugins/yubikey/corelib.php	Mon May 11 08:50:37 2009 -0400
@@ -201,7 +201,7 @@
   $tolerance = intval(getConfig('yubikey_api_ts_tolerance', 150));
   
   $now = time();
-  $timestamp = preg_replace('/Z[0-9]{3}$/', '', $timestamp);
+  $timestamp = preg_replace('/Z[0-9]{3,5}$/', '', $timestamp);
   $timestamp_seconds = strtotime($timestamp);
 
   if ( !$timestamp || !$now )