How to Get the Day of the Week in SQL Server using DATENAME and DATEPART?

Extracting the Day of the Week in SQL Server (2005/2008 and later)

A frequent requirement in SQL Server database management involves identifying the weekday corresponding to a given date. This functionality proves invaluable for tasks like scheduling or analyzing data based on the day of the week.

Leveraging Built-in Functions

SQL Server offers two native functions for this purpose: DATENAME and DATEPART.

Employing DATENAME

The DATENAME function yields a text string representing a specified date component. To obtain the weekday, use the 'dw' format specifier:

SELECT DATENAME(dw, '20090101') -- Returns 'Thursday'

Utilizing DATEPART

The DATEPART function returns a numerical value representing the specified date component. 'dw' signifies the day of the week (1 for Sunday, 7 for Saturday):

SELECT DATEPART(dw, '20090101') -- Returns 5 (Thursday)

Important Notes

• The examples above use a date string. You can substitute a date variable or expression.
• The returned weekday reflects the default language and date format settings of your SQL Server instance.
• For weekday retrieval in a different language, use the SET LANGUAGE statement to adjust the language setting.

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