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@ 2014-02-04T13:58:15Z

<?php
$key = 5; 
$thisWeekString = date('Y-m-d', strtotime('-'.$key.' days')) . '-';

?>

Output
Performance
VLD
References
Branches

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

preferences:dark modelive preview

37.9 ms | 402 KiB | 5 Q