Datediff function and the first day of the week - by Pawel Potasinski, MSFT

Status : 

  Fixed<br /><br />
		This item has been fixed in the current or upcoming version of this product.<br /><br />
		A more detailed explanation for the resolution of this particular item may have been provided in the comments section.

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ID 239958 Comments
Status Closed Workarounds
Type Bug Repros 2
Opened 11/21/2006 12:59:45 PM
Access Restriction Public


It seems that DATEDIFF function always uses Sunday as the first day of the week. Even if you use SET DATEFIRST just before using DATEDIFF.
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Posted by Microsoft on 10/18/2007 at 7:57 AM

It looks like this was closed without providing any feedback. The rationale for closing this was that changing the behavior to honor DATEFIRST would make it non-deterministic, and this would prevent building indexes on computed columns or views involving it. This behavior has been around for several versions, so this is a breaking change that doesn't seem worth it.