<!-- start JavaScript here
// This Script verifies user-input dates

var theDate = new Date(); //Date object defined in JavaScript
var theMonth = 0;      // set to 0 to initialize as integer variables
var theDay = 0;
var theYear = 0;
var dateCode = 0;      // set this variable to accept the verifyDate()
                       // return value


// ***** verifyDate()     ******************************************
// This function accepts three numbers that represent a date. month,
// day and year. It verifies whether the date is a valid one. This
// function callse isMonthOK(), isDayOK(), and isYearOK().
// if this function is called with only one parameter (a whole date
// string like 1/27/1998), this function will call seperateDates()
// and will function properly.
// This function's return values are as follows:
//       RETURN 0 - THE DATE IS VALID
//       RETURN 1 - THE MONTH IS NOT VALID
//       RETURN 2 - THE DAY IS NOT VALID
//       RETURN 3 - THE YEAR IS NOT VALID
//		 RETURN 4 - THE DATE IS UNREADABLE

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;
}


// ***** seperateDateString()     *******************************************
// This function is called by verifyDate() when it is passed only one 
// parameter. It seperates the date mm/dd/yyyy into it's individual date
// components and then re-calls verifyDate() with the three date parameters.

function seperateDateString(dateString) {
   var retVal = 0;
   var slash1 = 0;     //character index of 1st slash
   var slash2 = 0;     //character index of 2nd slash
   var numSlashes = 0; //make sure there are two slashes

   for (slash1; slash1 < dateString.length && numSlashes == 0; slash1++) {
      if (dateString.charAt(slash1) == '/') 
	     numSlashes++;
   }

   for (slash2 = slash1; slash2 < dateString.length && numSlashes == 1; slash2++) {
      if (dateString.charAt(slash2) == '/')
	     numSlashes++;
   }

   if (numSlashes == 2) {
	  
	  theDay = eval(dateString.substring(0, slash1 - 1));
	  theMonth = eval(dateString.substring(slash1, slash2 - 1));
	  theYear = eval(dateString.substring(slash2, dateString.length));

      retVal = verifyDate(theMonth, theDay, theYear);
   }
   else 
     retVal = 4;

   return retVal;
}


// ***** isMonthOK()     *******************************************
// This function checks theMonth variable set by verifyDate(). It
// returns 0 if the month is invalid, 1 if the month IS valid.
// This function should only be called by verifyDate()
function isMonthOK() {
   var retVal = 0;

   if(theMonth <= 12 && theMonth != 0) 
	  retVal = 1;
   else 
     retVal = 0;
   
   return retVal;
}

// ***** isDayOK()     *********************************************
// This function checks theDay variable set by verifyDate(). It
// returns 0 if the day is invalid, 1 if the day IS valid.
// theMonth variable is considered because there are different number
// of days in each month. Leap-year is also considered (divisible by 4).
// This function should only be called by verifyDate()
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;
}

// ***** isYearOK()     ****************************************************
// This function checks theYear variable set by verifyDate(). It
// returns 0 if the year is invalid, 1 if the year IS valid.
// This function should only be called by verifyDate()
function isYearOK() {
   var retVal = 0;
   
//   if (theYear <= 50 && theYear >= 0)
//      theYear += 2000;
//   else if (theYear <= 99 && theYear >= 51)
//      theYear += 1900;

   if (theYear >= 1900 && theYear <= 2050) 
      retVal = 1;
   else 
	  retVal = 0;

   return retVal;
}

function vDate(txtDate, txtLib)
{
var vDate = verifyDate(txtDate)
if(vDate!=0)
	{
	alert(txtLib + ' non valide!');
	return false;
	}
else
	{
	return true;
	}
}

/*Date Obligatoire*/
function vDate2(txtDate, txtLib)
{
	if(txtDate.length==0)
	{
		alert(txtLib + ' obligatoire!');
		return false;
	}
	
	return vDate(txtDate, txtLib);	
}

//end JavaScript -->