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@ 2014-02-14T15:33:04Z

<?php

$Start_Week = '201338';
$Optel_Week = 8;

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

$start->add(new DateInterval(sprintf('P%dW', $Optel_Week)));
echo $start->format('Y-m-d'), PHP_EOL;

Output
Performance
VLD
References
Branches

substr: documentation ( source)
sprintf: documentation ( source)

preferences:dark modelive preview

43.62 ms | 402 KiB | 5 Q