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@ 2014-02-10T13:37:24Z

<?php
$yr = "2014";
$week = "01";
$day = "1"; //Monday
echo date("Y-m-d", strtotime($yr . "W" . $week . $day)); // "2014W01D1"

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

preferences:dark modelive preview

53.57 ms | 402 KiB | 5 Q