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Asked: 2026-05-11T17:37:42+00:00

I’m using SS 2005 if that I’ve seen sample code like DECLARE @restore =

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I’m using SS 2005 if that

I’ve seen sample code like

DECLARE @restore = SELECT @@DATEFIRST
SET DATEFIRST 1
SELECT datepart(dw,ADateTimeColumn) as MondayBasedDate,.... FROM famousShipwrecks --
SET DATEFIRST @restore

Suppose while the query is running another query sets DATEFIRST?

If another query relies on datefirst being 7 (for example) and doesn’t set it, and runs while my query is running, that’s his problem for not setting it? or is there a better way to write queries that depend on a given day being day number 1.

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1 Answer

  1. Editorial Team

    @@DATEFIRST is local to your session. You can verify it by opening to tabs in Sql Server Management Studio (SSMS). Execute this code in the first tab:

     SET DATEFIRST 5

    And verify that it doesn’t affect the other tab with:

    select @@datefirst

    See this MSDN article.

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