SQL 2000 User-Defined Function .."cdate"

ALTER FUNCTION Cdate
   (@input varchar(50))
RETURNS smalldatetime
AS



BEGIN
DECLARE @Outputdate as Smalldatetime
SET @Outputdate = CAST(@input as smalldatetime)

IF @@error = ''

RETURN @Outputdate

ELSE
SET @Outputdate = CAST('1/1/1900' as smalldatetime)

RETURN @outputdate
END

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..trying to figure out how to "try" to cast a date, and if it errors out, then just return '1/1/1900'

I have lots of tables with lots of records .. where date of birth is not always proper.
I need to skip these records.. and can't get this working in a reliable way.
So far.. it bombs only on "out of range" dates.. and seems to be working for empty dates, and improperly formatted dates.
LVL 25
Ron MalmsteadInformation Services ManagerAsked:
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Jim HornMicrosoft SQL Server Developer, Architect, and AuthorCommented:
Copy this code that uses the IDSATE() function into your SSMS and let 'er rip..
Declare @input varchar(50), @outputdate datetime

SET @input = '2013-01-01'   -- 'banana', '2013-02-29'

IF ISDATE ( @input ) = 1
	begin
	SELECT 'It''s a date...'
	SET @outputdate = CAST(@input as datetime) 
	end 
ELSE
	begin
	SELECT 'No date for you...'
	SET @outputdate = '1900-01-01'
	end
	
SELECT @outputdate 

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Ron MalmsteadInformation Services ManagerAuthor Commented:
..still getting ..
The conversion of char data type to smalldatetime data type resulted in an out-of-range smalldatetime value

I believe this is when I have a DOB like this...
01/80/2013
..proper format.. so ISDATE() passes it.. but it's "out of range".
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Jim HornMicrosoft SQL Server Developer, Architect, and AuthorCommented:
Shouldn't, as 1/80/2013 will not convert to a date.
-- These return a 0, i.e. bad
SELECT ISDATE('1/80/2013')
SELECT ISDATE('2/30/2013')
-- This returns a 1, i.e. good
SELECT ISDATE(GETDATE())

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Jim HornMicrosoft SQL Server Developer, Architect, and AuthorCommented:
So ... how's it going?

Also, TechNet only has documentation on ISDATE() starting in version 2005, so if you are using SQL2K then we have to come up with an alternate solution.
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Jim HornMicrosoft SQL Server Developer, Architect, and AuthorCommented:
Disregard, found the documentation on ISDATE() for SQL2K, but it doesn't directly speak to bad dates such as '02-31-2013'
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Ron MalmsteadInformation Services ManagerAuthor Commented:
..the out f range exception cannot be avoided or ignored apparently.
So I had to manually filter out bad ones myself.

The only other way I can think of in 2k is to use cmdshell and pass it through my own utility, but I didn't want to put that much effort into it.. so..it is what it is. (stupid users)
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Jim HornMicrosoft SQL Server Developer, Architect, and AuthorCommented:
Usually stuff like this is better handled in the front-end, so I'd forward this issue to whoever's responsible for that.

Either that or use it as justification to ugrade to a more current version of SQL Server.

Thans for the grade.  Good luck.
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