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<?php
    $d = new DateTime('2015-12-31');
    $d->modify('first day of last month');
    echo $d->format('Y-m-28');
?>

Success #stdin #stdout 0.02s 24448KB

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Standard input is empty

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2015-11-28

https://ideone.com/pStgEK

language:

PHP (php 7.3.5)

created:

visibility:

public

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