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@ 2014-09-29T12:09:38Z

<?php
$quarter = round(date('i', $yourdate) / 15) * 15;
// get the new timestamp
$roundeddate = mktime(date("H",$yourdate), $quarter, date("s",$yourdate), date("n",$yourdate), date("j",$yourdate), date("Y",$yourdate));

echo $roundeddate;

Output
Performance
VLD
References
Branches

round: documentation ( source)
mktime: documentation ( source)
date: documentation ( source)

preferences:dark modelive preview

66.88 ms | 402 KiB | 5 Q