>William;
>
>Could you use a CompareValidator? It is easy to set up and works well.
>
>Depending upon what Browser your audience consists of, you might consider HTML side code in vbScript or JavaScript.
>
>Here is an example in vbScript:
>

><  script language=vbScript  >
>sub txtTodaysDate_OnBlur()
>     if len(trim(frmCustomer.txtTodaysDate.Value))> 0 then
>          if Not IsDate(frmCustomer.txtTodaysDate.Value) then
>           alert ("Not a valid date") frmCustomer.txtTodaysDate.focus()
>          end if
>     end if
>end sub
>< /script >
>

>
>Tom

What is IsDate function? Is it Visual Basic native function? What is C equavalent?