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@ 2022-08-31T13:32:49Z

<?php

$str = '01-2018';

$dateTime = new DateTime(preg_replace('~^(\d\d)-(\d\d\d\d)$~','$2W$1',$str));

var_dump($dateTime);

Output
Performance
VLD
References
Branches

var_dump: documentation ( source)
preg_replace: documentation ( source)

preferences:dark modelive previewkey bindings

29.06 ms | 405 KiB | 5 Q