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Date Manipulation with DATEADD/DATEDIFF


Date Manipulation with DATEADD/DATEDIFF

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Garadin
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Comments posted to this topic are about the item Date Manipulation with DATEADD/DATEDIFF

Seth Phelabaum
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vinaypugalia
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Great handy article !!

However, we can also achieve the same through -
SELECT CONVERT(DATETIME,DATEDIFF(dd,0,GETDATE()))

This way we can save the time taken to perform DATEADD operation though it would be quite marginal....

-Vinay Pugalia
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nakache
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the fastest way to remove time from datetime is:
select CONVERT(datetime,floor(convert(float,getdate())))

Itzik Ben-Gan had a big post on Date Manipulation with benchmarking..(long time ago..)
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For some common and uncommon date formats:

http://www.sql-server-helper.com/tips/date-formats.aspx

That site also has code for finding first/last day of month, week, and so on.
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Nice article Seth. I will be adding this article to my arsenal.



Jason AKA CirqueDeSQLeil
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Hi

I also use CAST(GETDATE() AS date) ... but it works only for sql server 2008 because in an earlier version date is not a type. Another point of view is that a smalldatetime use some bites for storing time even it is 00:00:000. The "date" type is more proper for this case.

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GlenParker
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Good article, well presented, will probably implement some of it.

Thanks!

Glen Parker :-)
lhowe
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Another method to strip the time from a date/time value and keep it as a datetime type would be: CONVERT(datetime,CONVERT(varchar,GetDate(),101))
tim.hulse
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Neat! Will definitely use it.
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On my system using the query for the first day of the week gives Monday instead of Sunday which is, of course, incorrect. Is this based on the locale of the system, or is that consistent behavior all together. After all, the first day of the week is always Sunday not Monday.

SELECT DATEADD(wk, DATEDIFF(wk,0,GETDATE()), 0)

query performed on 2010-04-07 08:42
query results in 2010-04-05 instead of expected 2010-04-04.

My locale should be en_US.
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