The day of the week can be retrieved in SQL Server by using the DatePart function. The value returned by function is between 1 (Sunday) and 7 (Saturday). To convert this to a string representing the day of the week, use a CASE statement.
Create function running following script:
CREATE FUNCTION dbo.udf_DayOfWeek(@dtDate DATETIME) RETURNS VARCHAR(10) AS BEGIN DECLARE @rtDayofWeek VARCHAR(10) SELECT @rtDayofWeek = CASE DATEPART(weekday,@dtDate) WHEN 1 THEN 'Sunday' WHEN 2 THEN 'Monday' WHEN 3 THEN 'Tuesday' WHEN 4 THEN 'Wednesday' WHEN 5 THEN 'Thursday' WHEN 6 THEN 'Friday' WHEN 7 THEN 'Saturday' END RETURN (@rtDayofWeek) END GO
Call this function like this:
SELECT dbo.udf_DayOfWeek(GETDATE()) AS DayOfWeek
SELECT DATENAME(dw, GETDATE())