checking for a date value

Can anyone tell me if, and if so, how I can check if a combination of dd, mm and yyyy is a valid date?

Thanx!

Code:

---

<script language='JavaScript'>
function checkDate() {
  var myDate = document.[formName].[textfieldname].value;
  // assuming that date format is MM/DD/YYYY
  var month = mydate.substring(0,2);
  var day = mydate.substring(3,5);
  var year = mydate.substring(6,10)

  //then you perform checks
  if (!((month > 0) && (month < 13))) {
    alert("Month must be 1-12!");
    reuturn false;
  }

  //
  // then for day and year

}

---

call that function upon submiting the form or whatever

Thanx, that's very nice, but it doesn't check wether or I enter November 31st as a date, for instance. I've written the whole function myself now, and it works, but I was just wondering if maybe there was a stadard function for it, but I guess the answer to that question is now, huh?

Thanx anyway!

Oh, in case anyone is interested, here's the code I came up with (granted: it doesn't check if the year is divisable by 100 or 400, but then again, if the code is still running in 2100, I'll come and adjust it for you personally) :

BTW, please pay no intention to the lack of indentation.. for some reason it won't work for me..

-----------------------------------------------------

function IsValidDate(myday, mymonth, myyear)
{
if ((myday < 1) || (myday > 31))
{
return false;
}
if ((mymonth < 1) || (mymonth > 12))
{
return false;
}
if (myyear < 2000)
{
return false;
}
switch (mymonth)
{
case "2" :
if (!((myday <= 28) || ((myday <= 29) && ((myyear % 4) = 0))))
{
return false;
}
case "4" :
if (myday > 30)
{
return false;
}
case "6" :
if (myday > 30)
{
return false;
}
case "9" :
if (myday > 30)
{
return false;
}
case "11" :
if (myday > 30)
{
return false;
}
}
return true;
}

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