Returns a Boolean value indicating whether an expression can be converted to a date.
Syntax
IsDate(expression)
The required expression argument is a Variant containing a date expression or string expression recognizable as a date or time.
Remarks
IsDate returns True if the expression is a date or can be converted to a valid date; otherwise, it returns False. In Microsoft Windows, the range of valid dates is January 1, 100 A.D. through December 31, 9999 A.D.; the ranges vary among operating systems.
Unlike a Date/Time field in Outlook, text descriptions such as "next Thursday" are not recognized as valid expressions for the IsDate function.