var dtCh= "/";
var minYear=1900;
var maxYear=2100;

// Verifies the input of a positive number
function isPosNumber(thisNumber,args)
{
      var input=args.Value;
      for (var i=0; i<input.length; i++)
      {
        var thisChar=input.charAt(i);
        if(thisChar<"0" || thisChar>"9" || thisChar ==".")
        { 
			args.IsValid = false;
            return;
        }
      }
      args.IsValid = true;
      return;
}

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 isValidInteger(args)
{
    s=args.value;
	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"))) 
        {
            args.value = "0";
            alert("Please enter a valid number");
            return false;
        }
    }
    // All characters are numbers.
    return true;
}

function DateKeyPress(sObjectName)
{
	var pKey = window.event.keyCode;
	
	//alert(sObjectName.value);
	
	if(sObjectName.value == "--/--/----" && pKey!=9 && pKey!=13 && pKey!=16)
	{
		sObjectName.value = "";
	}
}
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(dtStrCtl)
{
    try
    {
        var dtStr= dtStrCtl.value;
    }
    catch(e)
    {
        var dtStr = dtStrCtl;
    }
    
    if(dtStr == "")
    {
        dtStrCtl.value = "--/--/----";
    }
    else
    {
        try
        {
            if(dtStr != "--/--/----")
            {
	            var daysInMonth = DaysArray(12)
	            var pos1=dtStr.toString().indexOf(dtCh)
	            var pos2=dtStr.toString().indexOf(dtCh,pos1+1)
	            var strMonth=dtStr.toString().substring(0,pos1)
	            var strDay=dtStr.toString().substring(pos1+1,pos2)
	            var strYear=dtStr.toString().substring(pos2+1)
	            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 (pos1==-1 || pos2==-1){
		            alert("The date format should be : MM/DD/YYYY")
		            dtStrCtl.value = "--/--/----";
		            return false
	            }
	            if (strMonth.length<1 || month<1 || month>12){
		            alert("Please enter a valid month")
		            dtStrCtl.value = "--/--/----";
		            return false
	            }
	            if (strDay.length<1 || day<1 || day>31 || (month==2 && day>daysInFebruary(year)) || day > daysInMonth[month]){
		            alert("Please enter a valid day")
		            dtStrCtl.value = "--/--/----";
		            return false
	            }
	            if (strYear.length != 4 || year==0 || year<minYear || year>maxYear){
		            alert("Please enter a valid 4 digit year between "+minYear+" and "+maxYear)
		            dtStrCtl.value = "--/--/----";
		            return false
	            }
	            if (dtStr.indexOf(dtCh,pos2+1)!=-1 || isInteger(stripCharsInBag(dtStr, dtCh))==false){
		            alert("Please enter a valid date")
		            dtStrCtl.value = "--/--/----";
		            return false
	            }
	        }
	        
	    }
	   catch(e)
	        {
	        } 
	}
return true
}