Comments on: SQL SERVER – Validate Field For DATE datatype using function ISDATE()

By: virendra tyagi

virendra tyagi — Sat, 05 Mar 2011 11:25:56 +0000

Hi
Sir

Use isdate function

By: madhivanan

madhivanan — Wed, 23 Feb 2011 13:15:42 +0000

Explain the validation rules

By: vijay

vijay — Wed, 23 Feb 2011 06:00:09 +0000

hi i want the all validations for the given date

By: madhivanan

madhivanan — Tue, 15 Feb 2011 15:49:12 +0000

Use isdate function

if isdate(date)=1 and len(date)=10
–valid date

By: Joe

Joe — Wed, 09 Feb 2011 21:31:59 +0000

Fairly new to native sql. The user is sending a date defined as char(10). I need to check this to make sure it is coming in the format of yyyy-mm-dd. How do I do this?

By: Kashif

Kashif — Fri, 28 Jan 2011 09:15:15 +0000

Did you write code on the fly or checked it by executing your script.

—-Valid date
SELECT ISDATE(’12/12/20007)’
RETURNS : 1 (ONE)

Incorrect syntax near ’12/12/20007)’

By: madhivanan

madhivanan — Fri, 12 Nov 2010 13:47:04 +0000

Yes. It should have updated

By: madhivanan

madhivanan — Fri, 12 Nov 2010 13:42:41 +0000

Make sure to read this post
http://beyondrelational.com/blogs/madhivanan/archive/2010/06/03/understanding-datetime-column-part-ii.aspx

By: Tharindu Dhaneenja

Tharindu Dhaneenja — Fri, 12 Nov 2010 12:22:43 +0000

hi all,
pls vote this is important,
https://connect.microsoft.com/sql/feedback/ViewFeedback.aspx?FeedbackID=327335&wa=wsignin1.0

Thanks
Tharindu Dhaneenja

By: madhu Gorthi

madhu Gorthi — Mon, 27 Sep 2010 23:32:10 +0000

BTW in SQL Server 2008 there is a new datatype DATETIME2 which supports the dates from 0001-01-01 through 9999-12-31. But Microsoft did not update the ISDATE() function to support this date range. no even 2008 R2. This is funny.

By: Madhivanan

Madhivanan — Thu, 27 May 2010 15:10:21 +0000

select column_name, data_type from information_schema.columns
where table_name=’your_table’

By: VV

VV — Thu, 27 May 2010 13:10:40 +0000

Hi, I actually have a wider question: say we have a table where all columns are VARCHARs and we need to determine type of data in each column. I do understnad that result may not be 100% properly guaranteed but how would you solve this task ?

By: Madhivanan

Madhivanan — Tue, 25 May 2010 11:06:49 +0000

Yes. It is not reliable
Refer this for more informations and to knwo how to use it effectively
http://beyondrelational.com/blogs/madhivanan/archive/2007/09/24/handle-isdate-with-care.aspx

By: Madhivanan

Madhivanan — Tue, 25 May 2010 11:04:34 +0000

Post the code that caused the error

By: swethaa

swethaa — Tue, 25 May 2010 05:36:31 +0000

when inserting a row into the table which has a column with datatype smalldatetime im getting the following error

Conversion failed when converting character string to smalldatetime data type

how can i fix this error???

thanks

By: Tim

Tim — Fri, 30 Apr 2010 19:03:33 +0000

IsDate() is not reliable.

select isDate(’01/01/9607′) — returns 1
select convert(datetime,’01/01/9607′,1) — fails

By: Roshan

Roshan — Wed, 28 Apr 2010 16:44:42 +0000

There are some typos in the blog,

Just to make things clear ..
First – ISDATE Function validates a Date and returns a 1 when it comes across a valid date else returns 0

In the Blog the 2nd example still has an Invalid Date.

By: Pinal Dave

Pinal Dave — Sat, 06 Feb 2010 17:21:28 +0000

Hello Ashutosh,

How many row should this query return?
Because the record that you mention does not pass the criteria.
If there is other issue than please clarify.

Regards,
Pinal Dave

By: Ashutosh Katariya

Ashutosh Katariya — Sat, 06 Feb 2010 12:37:37 +0000

i have following records in this my datetime table

startdate enddate
2009-12-29 00:00:00.000 2010-02-28 00:00:00.000

when i run the following query :

select * from datetime where startdate>=’2010-01-31′ and enddate<='2010-02-15'

it will 0 row return : how?

Please help me
Thanks in advance

By: Patrick Moore

Patrick Moore — Wed, 30 Jul 2008 15:49:17 +0000

I ran into a similar problem that ran a little deeper.

I was converting some data that came from one of our Canadian clients and our office is in the U.S.

The problem I had with the IsDate function is that Canadian dates stored as VARCHAR(8) usually assume the French date style of DD/MM/YY. When trying to convert them, they would fail if the date was invalid.

Using IsDate from and American computer transposes the month and day field and also returns 0 for quite a few legit dates. As a result of this, I was unable to check for invalid dates.

I had to wrap most of my sql script inside a couple lines that temporarily change the local language to get the correct results from the IsDate function.

SET LANGUAGE French

–my code

SET LANGUAGE English

Is there any other way to do this without changing the language?

By: Madhivanan

Madhivanan — Fri, 15 Feb 2008 12:46:47 +0000

FYI, ISDATE() is not reliable

http://sqlblogcasts.com/blogs/madhivanan/archive/2007/09/24/hadle-isdate-with-care.aspx

By: Andrew

Andrew — Tue, 12 Feb 2008 18:03:55 +0000

–TheDate is a legacy varchar(10) column that allowed users to enter a date, 2/29/07, 02-29-2007, Today, Daily, etc…
–Why does ISDATE(TheDate) = 1 not restrict the result set before it does the cast?
–Conversion failed when converting character string to smalldatetime data type

SELECT
ID,
UserID,
TheDate
FROM
Table1
WHERE
ISDATE(TheDate) = 1
CAST(TheDate AS DATETIME) >= @Start_Date

–Instead I have to do this…

SELECT
ID,
UserID,
TheDate
FROM
Table1
WHERE
ISDATE(TheDate) = 1
AND TheDate ‘Daily’
AND TheDate ‘Today’
AND CAST(TheDate AS DATETIME) >= @Start_Date

By: Vijay

Vijay — Thu, 07 Feb 2008 04:24:33 +0000

Just be aware that the isdate() will not work with the new “date” datatype in SQL 2008

By: SQL SERVER - UDF - Validate Integer Function Journey to SQL Authority with Pinal Dave

Sat, 11 Aug 2007 14:19:48 +0000

[...] Aug 11th, 2007 by pinaldave I received quite a good feedback about my post about SQL SERVER – Validate Field For DATE datatype using function ISDATE() [...]