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@ 2014-02-10T13:29:22Z

<?php
$yr="2014";
$dif=2012-$yr;
$week="01";
$day="Monday";
$day=date("D",strtotime($day));
echo date("Y-m-d", strtotime($yr."W".$week."D ".$day));;
echo $dif;
?>

Output
Performance
VLD
References
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date: documentation ( source)
strtotime: documentation ( source)

preferences:dark modelive preview

37.02 ms | 402 KiB | 5 Q