// JavaScript Document
function validateFilterForm() {
	var HasError = false;
	if ( document.getElementById('srch_startDate') ) {
		var StartDate = document.getElementById('srch_startDate').value;
		var StartDateLength = StartDate.length;
		if ( StartDateLength > 0 ) {
			if ( ! isDate(StartDate) ) {
				HasError = true;	
			}
		}
	}
	if ( document.getElementById('srch_endDate') ) {
		var EndDate = document.getElementById('srch_endDate').value;
		var EndDateLength = EndDate.length;
		if ( EndDateLength > 0 ) {
			if ( ! isDate(EndDate) ) {
				HasError = true;	
			}
		}
	}
	if ( HasError == true ) {
		return false;
	} else {
		return true;	
	}
}

function isDate(dateStr) {
	var datePat = /^(\d{1,2})(\/|-)(\d{1,2})(\/|-)(\d{4})$/;
	var matchArray = dateStr.match(datePat); // is the format ok?
	if (matchArray == null) {
		alert("Please enter date as either mm/dd/yyyy or mm-dd-yyyy.");
		return false;
	}
	
	month = matchArray[1]; // p@rse date into variables
	day = matchArray[3];
	year = matchArray[5];
	
	if (month < 1 || month > 12) { // check month range
		alert("Month must be between 1 and 12.");
		return false;
	}
	if (day < 1 || day > 31) {
		alert("Day must be between 1 and 31.");
		return false;
	}
	if ((month==4 || month==6 || month==9 || month==11) && day==31) {
		alert("Month "+month+" doesn`t have 31 days!")
		return false;
	}
	if (month == 2) { // check for february 29th
		var isleap = (year % 4 == 0 && (year % 100 != 0 || year % 400 == 0));
		if (day > 29 || (day==29 && !isleap)) {
			alert("February " + year + " doesn`t have " + day + " days!");
			return false;
		}
	}
	return true; // date is valid
}