diff --git a/datelink.inc.php b/datelink.inc.php
index 280ae55..0eb30a7 100644
--- a/datelink.inc.php
+++ b/datelink.inc.php
@@ -1,5 +1,5 @@
 <?php
-// $Id: datelink.inc.php, v 0.3 2016/10/04
+// $Id: datelink.inc.php, v 0.4 2017/03/31
 // Copyright (C)
 //   2016 Kwansei Gakuin University comp-staff
 // License; GPL v2
@@ -29,8 +29,8 @@
 	$result = FALSE;
 	$argnum = func_num_args();
 	
-	// timestamp
-	$tstamp = time();
+	// timestamp in pukiwiki
+	$tstamp = UTIME;
 	
 	// description for some days beyond
 	if($argnum == 2) {