Pengurangan DateTime di PHP

http://php.net/manual/en/datetime.sub.php

http://www.php.net/manual/en/class.dateinterval.php

$date = new DateTime('2000-01-20');$date->sub(new DateInterval('P10D'));
echo $date->format('Y-m-d') . "\n";


or


<?php
$signupdate = strtotime('2010-05-01 15:03:50');$thirtydaysago = strtotime('-30 days');

if($signupdate > $thirtydaysago){
  #new member}?>