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<?php // change both dates' formats from d-m-Y to Y-m-d var_export( preg_replace( '~(\d{2})(-\d{2}-)(\d{4}) - (\d{2})(-\d{2}-)(\d{4})~', '$3$2$1 - $6$5$4', '25-05-2020 - 30-05-2020' ) );

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34.2 ms | 405 KiB | 5 Q