SQL DATEPART(dw,date) need monday = 1 and sunday = 7

Question

I have a Query where I get the WeekDay of a date but by default:

• Sunday = 1

• Moday = 2

• etc.

Answer 1

You can use this formula regardless of DATEFIRST setting :

((DatePart(WEEKDAY, getdate()) + @@DATEFIRST + 6 - [first day that you need] ) % 7) + 1;

for monday = 1

((DatePart(WEEKDAY, getdate()) + @@DATEFIRST + 6 - 1 ) % 7) + 1;

and for sunday = 1

((DatePart(WEEKDAY, getdate()) + @@DATEFIRST + 6 - 7 ) % 7) + 1;

and for friday = 1

((DatePart(WEEKDAY, getdate()) + @@DATEFIRST + 6 - 5 ) % 7) + 1;