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<?php $input = [ "2021-01-01", "2019-05-23", "2022-09-13", ]; $dates = array_map( function (string $dateString) { return (new \DateTimeImmutable($dateString))->format("Y-m-d"); }, $input ); sort($dates); var_dump($dates);
Output for 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
array(3) { [0]=> string(10) "2019-05-23" [1]=> string(10) "2021-01-01" [2]=> string(10) "2022-09-13" }

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