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@ 2016-02-16T04:26:52Z

<?php
    echo $wk_baseline = date('w', strtotime('01/01/2016')) . "\n";
    echo ceil(max(date('z', strtotime("1/18/2016")) + 1 - $wk_baseline,0) / 7) . "\n";
    echo date('z', strtotime("1/18/2016"));
?>

Output
Performance
VLD
References
Branches

ceil: documentation ( source)
date: documentation ( source)
max: documentation ( source)
strtotime: documentation ( source)

preferences:dark modelive preview

59.39 ms | 402 KiB | 5 Q