/* Function to remove the leading & trailing spaces */
function Trim(strInput) 
{
	strInput = LTrim(strInput);
	strInput = RTrim(strInput);
	return strInput;
}

/* Function to remove the leading spaces */
function LTrim(strInput)
{
	var intCntr;
	for (intCntr=0; intCntr < strInput.length; intCntr++) 
	{
		if (strInput.charAt(intCntr) != " ") 
			break;							
	}
	return strInput.substr(intCntr, strInput.length);
}

/* Function to remove the trailing spaces */
function RTrim(strInput)
{
	var intCntr;
	for (intCntr=strInput.length-1; intCntr > -1; intCntr--)
	{
		if (strInput.charAt(intCntr) != " ") 
			break;							
	}
	return strInput.substr(0, intCntr + 1);
}

/* Function for validating the date
   Declaring valid date character, minimum year and maximum year
*/
var dtCh= "/";
var dtCh1= "-";
var minYear=2000;
var maxYear=2050;
function isDate(dtStr)
{	
	var daysInMonth = DaysArray(12)
	dtCh= "/";
	dtCh1= "-";
	if (dtStr.indexOf(dtCh)==-1)
	{
		if (dtStr.indexOf(dtCh1) == -1)
		{
			return false;
		}
		else
		{
			dtCh=dtCh1;
		}
	}
	else
	{
		dtCh=dtCh;
	}
	
	var pos1=dtStr.indexOf(dtCh)
	var pos2=dtStr.indexOf(dtCh,pos1+1)
	var strMonth=dtStr.substring(0,pos1)
	var strDay=dtStr.substring(pos1+1,pos2)
	var strYear=dtStr.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)
	{
		return false
	}
	if (strMonth.length<1 || month<1 || month>12)
	{
		return false
	}
	if (strDay.length<1 || day<1 || day>31 || (month==2 && day>daysInFebruary(year)) || day > daysInMonth[month])
	{
		return false
	}
	if (strYear.length != 4 || year==0 || yearmaxYear)
	{	
		return false
	}
	if (dtStr.indexOf(dtCh,pos2+1)!=-1 || isInteger(stripCharsInBag(dtStr, dtCh))==false)
	{
		return false
	}
	return true
}

/* Function to return the number of days in a month */
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 to whether input parameter is a number or not */
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;
}



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

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