The IsDate function returns a Boolean value that indicates if the evaluated expression can be converted to a date. It returns True if the expression is a date or can be converted to a date; otherwise, it returns False.

Note: The IsDate function uses local setting to determine if a string can be converted to a date ("January" is not a month in all languages.)
Syntax
IsDate(expression)

Parameter 	Description
expression 	Required. The expression to be evaluated

Example 1

Legal dates:
<%

response.write(IsDate("April 22, 1947"))
response.write("< br />")
response.write(IsDate(#01/31/10#))

%>

The output of the code above will be:
True
True

Example 2

Illegal dates:
<%

response.write(IsDate("#01/31/10#"))
response.write("< br />")
response.write(IsDate("52/17/2010"))
response.write("< br />")
response.write(IsDate("Hello World!"))

%>

The output of the code above will be:
False
False
False