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@ 2015-06-22T10:11:38Z

<?php
$cdate=date('2015-06-20');
$weekno = date('W',strtotime($cdate));
$yr = date('Y',strtotime($cdate));
$dt = $yr."W".$weekno ;
echo  date('Y-m-d',strtotime( $dt));
$dtt=strtotime("+6 days", strtotime($dt));
echo date('Y-m-d', $dtt);
?>

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

preferences:dark modelive preview

49.1 ms | 402 KiB | 5 Q