public static function date_sort_callback($a, $b) {
		if($a->StartDate == $b->StartDate) {
			if($a->StartTime == $b->StartTime)
				return 0;
			else if(strtotime($a->StartTime) > strtotime($b->StartTime))
				return 1;
			else 
				return -1;
		}
		else if(strtotime($a->StartDate) > strtotime($b->StartDate))
			return 1;
		else 
			return -1;
		
	}
public static function date_sort_callback($a, $b) {
		if($a->StartDate == $b->StartDate) {
			if($a->StartTime == $b->StartTime)
				return 0;
			else if(strtotime($a->StartTime) > strtotime($b->StartTime))
				return 1;
			else 
				return -1;
		}
		else if(strtotime($a->StartDate) > strtotime($b->StartDate))
			return 1;
		else 
			return -1;
		
	}
public static function date_sort_callback ( $ a , $ b ) { if ( $ a -> StartDate == $ b -> StartDate ) { if ( $ a -> StartTime == $ b -> StartTime ) return 0 ; else if ( strtotime ( $ a -> StartTime ) > strtotime ( $ b -> StartTime ) ) return 1 ; else return - 1 ; } else if ( strtotime ( $ a -> StartDate ) > strtotime ( $ b -> StartDate ) ) return 1 ; else return - 1 ; }
Callback used by column_sort
Callback used by column_sort