- date_create: documentation ( source)
- mktime: documentation ( source)
- date: documentation ( source)
- date_format: documentation ( source)
<?php
$time1 = mktime(0, 0, 0, date("m")-6, date("d"), date("Y"));
$date = date_create('now');
echo date("Ymd",$time1);
echo date_format($date, 'Ymd');
?>