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<?php $d = new DateTime("first day of january 2017"); echo "first day of: ", $d->setDate(2015, 12, 31)->format("Y-m-d"); $d = new DateTime("last day of december 2017"); echo "\nlast day of: ", $d->setDate(2016, 1, 1)->format("Y-m-d");
Output for git.master, git.master_jit, rfc.property-hooks
first day of: 2015-12-31 last day of: 2016-01-01

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