IsDate (dates) Purpose Determines whether the supplied argument is a valid date. It returns TRUE or FALSE depending on whether the supplied argument is a valid date. Syntax IsDate (DateExpression) DateExpression A string, date, or any numeric data type. Example Sub Main()         Dim d As Date         Dim s As String         s = "1/2/97"         If IsDate(s) Then                 d=s                 Print "Valid date format"         Else                 Print "Invalid date format"         End If End Sub