I was wonder how I would go about making sure something within a text box is a valid date. I know that usually I would use JavaScript but I don’t know if that’s possible to use within an asp page. I would also imagine that using asp there would be another way of validating a date anyway without have to introduce another language.

From various Google searches I have found a few things that didn’t work. Mainly people are saying use the IsDate function, but that won’t tell you if it’s a VALID date but only if it IS a date.

I’m also looking to see if the dates not in the past, I don’t think this will be hard after I find a way to validate it though.

Other information: The format will be mm/dd/yyyy

First, IsDate will tell you whether something is a valid date or not, it's just you have your own definition of valid. But try passing January 41, 2104 and it'll say no way Jose. Also, JavaScript is indeed the way to go here, because it can be done on the client end without having to make a round trip to your web server. And absolutely you can mix JS and ASP. But you seem uncomfortable with the idea, so I'll show you how to do it in ASP using VBScript, and then you can move on when you're ready.

Public Function IsOkayDate(someValue As String) As Boolean
If IsDate(someValue) Then If CDate(someValue) > Now() Then If Format(CDate(someValue), "mm/dd/yyy") = someValue Then Return True
Return False
End Function

Okay, what do I win?

Use a regular expression
The pattern for mm/dd/yyyy is

"(0[1-9]|1[012])[- /.](0[1-9]|[12][0-9]|3[01])[- /.](19|20)\d\d"

and a function from my code library is;

function CheckDate(strIn)
' function to validate date input
	dim objRE
	set objRE = New RegExp
	objRE.Pattern = "(0[1-9]|1[012])[- /.](0[1-9]|[12][0-9]|3[01])[- /.](19|20)\d\d"
	objRE.Global = True
	CheckDate = objRE.test(strIn)
	set objRE = nothing
end function

It will return true is the date is valid and false is not

It seems my problem now is how do i call this. I was thinking, on the submit i would move to an invisible page that would do all of the validation then if its valid redirect to the next page, if it wasnt go back and show where the errors were. cleint side/server side isnt a big deal since this will be for an in-house help desk site for a company of ~60

http://truegeeks.com/asp/aspexamples/gendate/edate1.asp <--- I don't normally recommend scripts, but this one isn't bad as long as you tweak it a bit.