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<?php $dt = \DateTime::createFromFormat('Y-m-d', '2018-10-31'); $dt2 = $dt; // 月初 echo $dt->modify('first day of 00:00:00')->modify('next month')->format('Y-m-d'); // 2018-11-01 echo $dt2->modify('first day of 00:00:00')->modify('last month')->format('Y-m-d'); // 2018-10-01
Output for git.master_jit, git.master, rfc.property-hooks
2018-11-012018-10-01

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