Steps to reproduce the issue

file : media/system/js/fields/calendar-locales/date/jalali/date-helper.js
Error : This function not return required data

Date.prototype.getLocalMonthDays = function(dateType, month) {
	if (dateType != 'gregorian') {
		/** Modify to match the current calendar when overriding **/
		var year = this.getLocalFullYear('jalali');
		if (typeof month == "undefined") {
			month = this.getLocalMonth('jalali');
		}
		if (((0 == (year%4)) && ( (0 != (year%100)) || (0 == (year%400)))) && month == 1) {
			return 29;
		} else {
			Date.local_MD[month]; <=== Error : Must be returned this value
		}
	} else {
		var year = this.getFullYear();
		if (typeof month == "undefined") {
			month = this.getMonth();
		}
		if (((0 == (year%4)) && ( (0 != (year%100)) || (0 == (year%400)))) && month == 1) {
			return 29;
		} else {
			return Date.gregorian_MD[month]; <==== Like this
		}
	}
};

Expected result

This is Expected

Date.prototype.getLocalMonthDays = function(dateType, month) {
	if (dateType != 'gregorian') {
		/** Modify to match the current calendar when overriding **/
		var year = this.getLocalFullYear('jalali');
		if (typeof month == "undefined") {
			month = this.getLocalMonth('jalali');
		}
		if (((0 == (year%4)) && ( (0 != (year%100)) || (0 == (year%400)))) && month == 1) {
			return 29;
		} else {
			return Date.local_MD[month];
		}
	} else {
		var year = this.getFullYear();
		if (typeof month == "undefined") {
			month = this.getMonth();
		}
		if (((0 == (year%4)) && ( (0 != (year%100)) || (0 == (year%400)))) && month == 1) {
			return 29;
		} else {
			return Date.gregorian_MD[month];
		}
	}
};

Actual result

System information (as much as possible)

Additional comments