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@ 2014-01-07T14:20:37Z

<?php

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

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

preferences:dark modelive preview

46.09 ms | 402 KiB | 5 Q