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@ 2014-09-22T07:16:52Z

<?php
$f1 = date("Ymd");
$f2 = date("Ymd", strtotime("-7 days"));
echo " $f2\n-$f1\n--------\n".($f2-$f1);

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

preferences:dark modelive preview

38.6 ms | 402 KiB | 5 Q