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@ 2016-01-22T19:10:54Z

<?php

$d = date("2016-01-01 22:00:00");

var_dump($d);

$dst = $d->format("Y-W");
var_dump($dst);

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

preferences:dark modelive preview

58.78 ms | 402 KiB | 5 Q