How to check if a date is a valid date in Sql Server 2005

At times, in our stored procedures or sql queries, we need to check if the date specified in the variables is a valid date.

Use the ISDATE() function.

The
ISDATE() function determines whether the variable or the expression
contains a valid date. It returns 1(true) if the input expression is a
valid date; otherwise, it returns 0 (false).

For eg:

DECLARE @dt varchar(10)

SET @dt = '02/21/08'

SELECT ISDATE(@dt)

-- Returns 1

DECLARE @dt varchar(10)

SET @dt = '13/21/08'

SELECT ISDATE(@dt)

-- Returns 0 as 13 is not a valid month