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<?php $str = '01-2018'; $dateTime = new DateTime(preg_replace('~^(\d\d)-(\d\d\d\d)$~','$2W$1',$str)); var_dump($dateTime);
Output for 7.4.0 - 7.4.33, 8.0.1 - 8.0.30, 8.1.0 - 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.30, 8.4.1 - 8.4.18, 8.5.0 - 8.5.3
object(DateTime)#1 (3) { ["date"]=> string(26) "2018-01-01 00:00:00.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" }
preferences:
94.49 ms | 1267 KiB | 4 Q