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<?php $datetimeStart1 = new DateTime('2015-12-10'); $datetimeEnd1 = new DateTime('2015-12-20'); $datetimeStart2 = new DateTime('2015-12-12'); $datetimeEnd2 = new DateTime('2015-12-28'); // following http://stackoverflow.com/questions/325933/determine-whether-two-date-ranges-overlap if ($datetimeStart1 < $datetimeEnd2 && $datetimeEnd1 > $datetimeStart2) { echo min($datetimeEnd1,$datetimeEnd2)->diff(max($datetimeStart2,$datetimeStart1))->days+1; } else { echo 'no overlap'; }
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