PHP 日期函数 date_format()

<?php
   $dateSrc = '2005-04-19 12:50 GMT';
   $dateTime = date_create( $dateSrc);;
   # Now set a new date using date_format();
   date_format( $dateTime, 2000, 12, 12);

   echo "New Formatted date is ". $dateTime->format("Y-m-d\TH:i:s\Z");
   echo "<br />";

   # Using second function.
   $dateTime = new DateTime($dateSrc);
   $dateTime->setDate( 1999, 10, 12);

   echo "New Formatted date is ". $dateTime->format("Y-m-d\TH:i:s\Z");
?>