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<?php $a = "2018-12-30"; $b = "2019-12-12"; $i = date("Ym", strtotime($a)); while($i <= date("Ym", strtotime($b))){ echo $i."\n"; if(substr($i, 4, 2) == "12") $i = (date("Y", strtotime($i."01")) + 1)."01"; else $i++; }
Output for git.master, git.master_jit, rfc.property-hooks
201812 201901 201902 201903 201904 201905 201906 201907 201908 201909 201910 201911 201912

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