var dtCh= "/";
var minYear = new Date().getFullYear() - 99;
var maxYear = 2100;
var countrySetting;

function isInteger(s){
	var i;
    for (i = 0; i < s.length; i++){   
        // Check that current character is number.
        var c = s.charAt(i);
        if (((c < "0") || (c > "9"))) return false;
    } 
    // All characters are numbers. 
    return true;  
}

function stripCharsInBag(s, bag){
	var i;
    var returnString = "";
    // Search through string's characters one by one.
    // If character is not in bag, append to returnString.
    for (i = 0; i < s.length; i++){   
        var c = s.charAt(i);
        if (bag.indexOf(c) == -1) returnString += c;
    }
    return returnString;
}

function daysInFebruary (year){
	// February has 29 days in any year evenly divisible by four,
    // EXCEPT for centurial years which are not also divisible by 400.
    return (((year % 4 == 0) && ( (!(year % 100 == 0)) || (year % 400 == 0))) ? 29 : 28 );
}

function DaysArray(n) {
	for (var i = 1; i <= n; i++) {
		this[i] = 31
		if (i==4 || i==6 || i==9 || i==11) {this[i] = 30}
		if (i==2) {this[i] = 29}
   } 
   return this
}

function isDate(dtStr, minAge){

	var daysInMonth = DaysArray(12);
	var pos1=dtStr.indexOf(dtCh);
	var pos2=dtStr.indexOf(dtCh,pos1+1);

	if (pos1==-1 || pos2==-1)
		return false;

	//Split date string depending on current country setting
	switch(countrySetting)
	{
		case "US":
			var strMonth=dtStr.substring(0,pos1);
			var strDay=dtStr.substring(pos1+1,pos2);
			var strYear=dtStr.substring(pos2+1);
			break;
		default: //UK
			var strDay=dtStr.substring(0,pos1);
			var strMonth=dtStr.substring(pos1+1,pos2);
			var strYear=dtStr.substring(pos2+1);
			break;
	}
	
	strYr=strYear;
	if (strDay.charAt(0)=="0" && strDay.length>1) strDay=strDay.substring(1);
	if (strMonth.charAt(0)=="0" && strMonth.length>1) strMonth=strMonth.substring(1);
	for (var i = 1; i <= 3; i++) {
		if (strYr.charAt(0)=="0" && strYr.length>1) strYr=strYr.substring(1);
	}
	month=parseInt(strMonth);
	day=parseInt(strDay);
	year=parseInt(strYr);
	
	if (strMonth.length<1 || month<1 || month>12){
		//alert("Please enter a valid month")
		return false;
	}
	if (strDay.length<1 || day<1 || day>31 || (month==2 && day>daysInFebruary(year)) || day > daysInMonth[month]){
		//alert("Please enter a valid day")
		return false;  
	}
	if (strYear.length != 4 || year==0 || year<minYear || year>maxYear){
		//alert("Please enter a valid 4 digit year between "+minYear+" and "+maxYear)
		return false;
	}
	if (dtStr.indexOf(dtCh,pos2+1)!=-1 || isInteger(stripCharsInBag(dtStr, dtCh))==false){
		//alert("Please enter a valid date")
		return false;
	}
	if(minAge)
	{
		theDate = new Date(year + parseInt(minAge), month-1, day);
		today = new Date();
		if(theDate > today) return false
	}
	
return true;
}


// function called by custom validator
function CheckDate(sender, args)
{
	var minAge = $(sender.controltovalidate).minAge;

	var newMaxYear = $(sender.controltovalidate).maxYear;
	var newMinYear = $(sender.controltovalidate).minYear;
	if(newMinYear && newMinYear.length > 0) minYear = parseInt(newMinYear);
	if(newMaxYear && newMaxYear.length > 0) maxYear = parseInt(newMaxYear);

	//Get current country setting
	countrySetting = $(sender.controltovalidate).countrySetting;

	if(minAge > 0) 
	{
		args.IsValid = isDate(args.Value, minAge);
	}
	else
	{
		args.IsValid = isDate(args.Value);
	}  
}

function TrimString(s) {
    var m = s.match(/^\s*(\S+(\s+\S+)*)\s*$/);
    return (m == null) ? "" : m[1];
}

function RequiredFieldValidatorEvaluateIsValid(val) {
    return (ValidatorTrim(ValidatorGetValue(val.controltovalidate)) != ValidatorTrim(val.initialvalue))
}