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@ 2013-11-04T19:04:30Z

<?php
echo $drst = strtotime('2013-10-31');

echo $drstRev = strtotime('-1 month', $drst);

echo date('Y-m-d', $drstRev);
?>

Output
Performance
VLD
References
Branches

date: documentation ( source)
strtotime: documentation ( source)

preferences:dark modelive preview

39.04 ms | 402 KiB | 5 Q