/**
 * DHTML date validation script. Courtesy of SmartWebby.com (http://www.smartwebby.com/dhtml/)
 */
// Declaring valid date character, minimum year and maximum year
var dtCh= "/";
var minYear=1900;
var maxYear=2100;

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 IsNumber(fld){

   var ValidChars = "0123456789.$";
   var IsNum=true;
   var Char;
   sText=fld.value;

    for (i = 0; i < sText.length && IsNum == true; i++)
      {
	Char = sText.charAt(i);
     if (ValidChars.indexOf(Char) == -1)
         {

         IsNum = false;
         }
      }

return IsNum;
}


function datecall(dtfrom,dtto)
{
//Set the two dates

today=new Date(dtfrom);
var christmas=new Date(dtto) //Month is 0-11 in JavaScript
//if (today.getMonth()==11 && today.getDate()>25) //if Christmas has passed already
//christmas.setFullYear(christmas.getFullYear()+1) //calculate next year's Christmas
//Set 1 day in milliseconds
var one_day=1000*60*60*24

//Calculate difference btw the two dates, and convert to days
  return Math.ceil((christmas.getTime()-today.getTime())/(one_day))
}

function GetDayname(dt){

  return dt.getDay();
}


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){
	var daysInMonth = DaysArray(12)
	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){
		alert("The date format should be : mm/dd/yyyy")
		return false
	}
	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
	}
return true
}

function compareDates2 (value1, value2) {
	   var date1, date2;
   	var month1, month2;
   	var year1, year2;
        
   	month1 =Number( value1.substring (0, value1.indexOf ("/")));
   	date1 = Number(value1.substring (value1.indexOf ("/")+1, value1.lastIndexOf ("/")));
   	year1 = Number(value1.substring (value1.lastIndexOf ("/")+1, value1.length));

   	month2 = Number(value2.substring (0, value2.indexOf ("/")));
   	date2 = Number(value2.substring (value2.indexOf ("/")+1, value2.lastIndexOf ("/")));
   	year2 = Number(value2.substring (value2.lastIndexOf ("/")+1, value2.length));

	//alert(value1+' '+ value2);
   	if (year1 > year2) return 1;
   	else if (year1 < year2) return -1;
	
   	else if (month1 > month2) return 1;
   	else if (month1 < month2) return -1;
	else if (date1 > date2) return 1;
   	else if (date1 < date2) return -1;
	else if(year1 == year2 && month1 == month2 && date1 == date2) return -1
	else return 0;
	
}

function compareDates (value1, value2) {
	   var date1, date2;
   	var month1, month2;
   	var year1, year2;

   	month1 =Number( value1.substring (0, value1.indexOf ("/")));
   	date1 = Number(value1.substring (value1.indexOf ("/")+1, value1.lastIndexOf ("/")));
   	year1 = Number(value1.substring (value1.lastIndexOf ("/")+1, value1.length));

   	month2 = Number(value2.substring (0, value2.indexOf ("/")));
   	date2 = Number(value2.substring (value2.indexOf ("/")+1, value2.lastIndexOf ("/")));
   	year2 = Number(value2.substring (value2.lastIndexOf ("/")+1, value2.length));

   	if (year1 > year2) return 1;
   		else if (year1 < year2) return -1;
		
   	else if (month1 > month2) return 1;
   	else if (month1 < month2) return -1;
	
   	else if (date1 > date2) return 1;
   	else if (date1 < date2) return -1;
	
 
   	else return 0;
}