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<?php $getAlldate = [ "2018-08-17", "2018-08-20", "2018-08-21", "2018-08-22", "2018-08-23", "2018-08-24", "2018-08-27", "2018-08-28" ]; $getHoliday=[ "2019-1-1", "2019-3-6", "2019-2-28", "2019-5-2", "2019-4-25", "2018-8-27", "2018-8-28" ]; $formattedHoliday = array_map(function ($holiday) { $alldateFormat = 'Y-m-d'; $HolidayFormat = 'Y-n-d'; $date = DateTime::createFromFormat($HolidayFormat, $holiday); return $date->format($alldateFormat); }, $getHoliday); var_dump(array_diff($getAlldate, $formattedHoliday));