Index: /temp/trunk/html/test/uehara/time_test.php
===================================================================
--- /temp/trunk/html/test/uehara/time_test.php	(revision 8328)
+++ /temp/trunk/html/test/uehara/time_test.php	(revision 8328)
@@ -0,0 +1,10 @@
+<?php
+
+	$end_date = date("Y/m/d", time()); 
+	$start_date = date("Y/m/d",strtotime("-10 year" ,strtotime($end_date)));
+	for($i=0; $i<20; $i++) {
+		$start_date = date("Y/m/d",strtotime("-10 year",strtotime($start_date)));
+		echo $start_date."<br/>\n";
+	}
+
+?>