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@ 2014-01-07T14:20:07Z

<?php

echo date('YW', strtotime('2013-12-30'));
echo date('oW', strtotime('2013-12-30'));

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

preferences:dark modelive preview

34.79 ms | 402 KiB | 5 Q