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SQL SERVER – @@DATEFIRST and SET DATEFIRST Relations and Usage

Pinal Dave
SQL Tips and Tricks
4 Comments

SET DATEFIRST and @@DATEFIRST control and report the first day of the week in SQL Server. The master database’s syslanguages table has a DateFirst column that defines the first day of the week for a particular language. SQL Server with US English as default language, SQL Server sets DATEFIRST to 7 (Sunday) by default. We can reset any day as first day of the week using

SQL SERVER - @@DATEFIRST and SET DATEFIRST Relations and Usage

SET DATEFIRST 5

This will set Friday as first day of week.
@@DATEFIRST returns the current value, for the session, of SET DATEFIRST.

SET LANGUAGE italian
GO
SELECT @@DATEFIRST
GO
----This will return result as 1(Monday)
SET LANGUAGE us_english
GO
SELECT @@DATEFIRST
GO
----This will return result as 7(Sunday)

In this way @@DATEFIRST and SET DATEFIRST are related. When I learned about this feature I was very glad as our company has started to server global clients and simple feature like this helps a lot to avoid confusion.

Published by Pinal Dave on SQLAuthority. More of my work at pinaldave.com.

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