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POIs it possible to set start of week for T-SQL DATEDIFF function?
 

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  1. POIs it possible to set start of week for T-SQL DATEDIFF function?
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    <p>I use <a href="http://msdn.microsoft.com/en-us/library/ms189794.aspx" rel="noreferrer">DATEDIFF</a> function to filter records added this week only:</p> <pre><code>DATEDIFF(week, DateCreated, GETDATE()) = 0 </code></pre> <p>and I noticed what it's assumed what week starts on Sunday. But in my case I would prefer to set start of week on Monday. Is it possible somehow in T-SQL?</p> <p>Thanks!</p> <hr> <p><strong>Update:</strong></p> <p>Below is an example showing what DATEDIFF doesn't check <a href="http://msdn.microsoft.com/en-us/library/ms187766.aspx" rel="noreferrer">@@DATEFIRST</a> variable so I need another solution.</p> <pre><code>SET DATEFIRST 1; SELECT DateCreated, DATEDIFF(week, DateCreated, CAST('20090725' AS DATETIME)) AS D25, DATEDIFF(week, DateCreated, CAST('20090726' AS DATETIME)) AS D26 FROM ( SELECT CAST('20090724' AS DATETIME) AS DateCreated UNION SELECT CAST('20090725' AS DATETIME) AS DateCreated ) AS T </code></pre> <p>Output:</p> <pre><code>DateCreated D25 D26 ----------------------- ----------- ----------- 2009-07-24 00:00:00.000 0 1 2009-07-25 00:00:00.000 0 1 (2 row(s) affected) </code></pre> <p>26 Jul 2009 is Sunday, and I want DATEDIFF returns 0 in third column too. </p>
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    1. USAlexander Prokofyev
    1. USAlexander Prokofyev
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    1. COSorry for not checking that the DateFirst was checked by datediff, who would have guessed, I've updated my answer to take this into account.
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