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<?php // Set demo vars $year = 2012; $months = array(10,11,12); $days = array(1,2,3,4,6,7,8,9,11,12,13,14,16,17,18,19,21,22,23,24,26,27,28,30); $dateWs = array(); foreach($months AS $month) foreach($days AS $day) $datesWS[] = new DateTime(implode('-',array($year,$month,$day))); // Push DateTime object to the WebService array // Shuffle shuffle($datesWS); // Sort dates usort($datesWS, function ($a, $b){ return ($a == $b) ? 0 : (($a > $b) ? 1 : -1); }); $dateIni = count($datesWS)>0 ? reset($datesWS) : 0; // Get first date $dateEnd = count($datesWS)>0 ? end($datesWS) : 0; // Get last date $interval = new DateInterval('P1D'); // Set date interval as 1 day // Generate dates range and Transform iterator to array $datesRange = iterator_to_array(new DatePeriod($dateIni, $interval, $dateEnd->modify( '+1 day' ))); // This way seems to work $excludeDates = array(); foreach($datesRange AS $date) { if(!in_array($date->format('d/m/Y'),array_values(array_map(function($obj){ return $obj->format('d/m/Y'); },$datesWS)))) $excludeDates[] = $date->format('d/m/Y'); } var_dump($excludeDates); /* // This way should be more efficient, but I'm fed up with it! // Get excluded dates $excludeDates = array_udiff($datesRange, $datesWS, function ($a, $b) { return $a == $b ? 0 : 1; }); // Comment/Uncomment this in order to print this method or the other one // Print array(objects) as array(strings) var_dump(array_values(array_map(function($obj){ return $obj->format('d/m/Y'); },$datesWS))); var_dump(array_values(array_map(function($obj){ return $obj->format('d/m/Y'); },$datesRange))); var_dump(array_values(array_map(function($obj){ return $obj->format('d/m/Y'); },$excludeDates))); */ ?>