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Converting to datetime a char field with several possible date formats


Converting to datetime a char field with several possible date formats

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Federico Iori
Federico Iori
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Comments posted to this topic are about the item Converting to datetime a char field with several possible date formats
Jeff Moden
Jeff Moden
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Thanks for sharing your code but it just doesn't need to be so complex a thing. SQL Server will handle all sorts of date formats without any help. The only time it really runs into a problem is where you have DMY and MDY formats in the same column so it wouldn't be able to figure out if 3/7/2005 is in March or July in a mixed column... just like your code won't be able to.

For code that follows one standard (eithe DMY or MDY) in a given column. No special processing for format is needed. For example:

SET DATEFORMAT DMY

SELECT SomeStringDate
, ConvertedToDateTime = CAST(d.SomeStringDate AS DATETIME)
FROM (
SELECT '15-03-05' UNION ALL
SELECT '15/03/08' UNION ALL
SELECT '15/03/2005' UNION ALL
SELECT '15.03.2005' UNION ALL
SELECT 'March 15 2005' UNION ALL
SELECT 'Mar 15 2005' UNION ALL
SELECT '15 March 2005' UNION ALL
SELECT '15 Mar 2005' UNION ALL
SELECT '20050315'
) d (SomeStringDate)
;



--Jeff Moden

RBAR is pronounced ree-bar and is a Modenism for Row-By-Agonizing-Row.
First step towards the paradigm shift of writing Set Based code:
Stop thinking about what you want to do to a row... think, instead, of what you want to do to a column.
Although they tell us that they want it real bad, our primary goal is to ensure that we dont actually give it to them that way.
Although change is inevitable, change for the better is not.
Just because you can do something in PowerShell, doesnt mean you should. Wink

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Federico Iori
Federico Iori
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Thanks a lot, I did not know about SET DATEFORMAT
Jeff Moden
Jeff Moden
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Glad to help. Thank you for the feedback.

--Jeff Moden

RBAR is pronounced ree-bar and is a Modenism for Row-By-Agonizing-Row.
First step towards the paradigm shift of writing Set Based code:
Stop thinking about what you want to do to a row... think, instead, of what you want to do to a column.
Although they tell us that they want it real bad, our primary goal is to ensure that we dont actually give it to them that way.
Although change is inevitable, change for the better is not.
Just because you can do something in PowerShell, doesnt mean you should. Wink

Helpful Links:
How to post code problems
How to post performance problems
Forum FAQs
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