//***************************************************************************************************
//********************************   Date Validation starts here*************************************
//***************************************************************************************************

var theDate = new Date(); 
var theMonth = 0;      
var theDay = 0;
var theYear = 0;
var dateCode = 0;      
                       
function checkComboDate(dd,mm,yy,errmsg)
{
//document.myform.spotdatefromday[document.myform.spotdatefromday.selectedIndex].value,document.myform.spotdatefromyear[document.myform.spotdatefromyear.selectedIndex].value)
	if (verifyDate(mm[mm.selectedIndex].value,dd[dd.selectedIndex].value,yy[yy.selectedIndex].value)!=0)
	{
		alert(errmsg);
		dd.focus();
		return false;
	}
	return true;
}
function verifyDate(enteredMonth, enteredDay, enteredYear) {

	retVal = 0;

	theMonth = eval(enteredMonth);
	theDay = eval(enteredDay);
	theYear = eval(enteredYear);

   if(enteredDay == null && enteredYear == null)
      retVal = seperateDateString(enteredMonth);
   else if (isMonthOK() == 0)
      retVal = 1;
   else if (isDayOK() == 0)
      retVal = 2;
   else if (isYearOK() == 0)
      retVal = 3;

   return retVal;
}

function seperateDateString(dateString) {

   var retVal = 0;
   var slash1 = 0;     
   var slash2 = 0;     
   var numSlashes = 0; 

   for (slash1; slash1 < dateString.length && numSlashes == 0; slash1++) {
      if (dateString.charAt(slash1) == '/' || dateString.charAt(slash1) == '-') 
	     numSlashes++;
   }

   for (slash2 = slash1; slash2 < dateString.length && numSlashes == 1; slash2++) {
      if (dateString.charAt(slash2) == '/' || dateString.charAt(slash2) == '-')
	     numSlashes++;
   }

   if (numSlashes == 2) {
	  
	  theMonth = eval(dateString.substring(0, slash1 - 1));
	  theDay = eval(dateString.substring(slash1, slash2 - 1));
	  theYear = eval(dateString.substring(slash2, dateString.length));

      retVal = verifyDate(theMonth, theDay, theYear);
   }
   else 
     retVal = 4;

   return retVal;
}

function isMonthOK() {
   var retVal = 0;

   if(theMonth <= 12 && theMonth != 0) 
	  retVal = 1;
   else 
     retVal = 0;
   
   return retVal;
}

function isDayOK() {
   var retVal = 0;

   if(theMonth == 1 || theMonth == 3 || theMonth == 5 || theMonth == 7
       || theMonth == 8 || theMonth == 10 || theMonth == 12) {
	   if (theDay >= 1 && theDay <= 31) 
	      retVal = 1;
	   else 
         retVal = 0;
   }
   else if (theMonth == 2) {
      if (theDay >= 1 && theDay <=28) 
	     retVal = 1;
	  else if (theDay == 29 && (theYear % 4) == 0) 
	     retVal = 1;  // valid leap-year
      else if (theDay == 29 && (theYear % 4) != 0) 
		 retVal = 0;
	  else 
		 retVal = 0;
   }
   else {
      if (theDay >= 1 && theDay <= 30) 
	     retVal = 1;
	  else 
         retVal = 0;
   }
   return retVal;
}


function isYearOK() {
   var retVal = 0;
   
   if (theYear <= 50 && theYear >= 0)
      theYear += 2000;
   else if (theYear <= 99 && theYear >= 51)
      theYear += 1900;

   if (theYear >= 1951 && theYear <= 2050) 
      retVal = 1;
   else 
	  retVal = 0;

   return retVal;
}
//***************************************************************************************************
//***************************************Date Validation ends here***********************************
//***************************************************************************************************