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@ 2014-02-14T15:30:42Z

<?php

$Start_Week = '201338';

$start = new DateTime();
$start->setISODate(substr($Start_Week, 0, 4), substr($Start_Week, 4, 2));
echo $start->format('Y-m-d');

Output
Performance
VLD
References
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substr: documentation ( source)

preferences:dark modelive preview

122.31 ms | 402 KiB | 5 Q