Week part

I have a sql query that groups on "Datepart(dw, DateField)" however in some cases the week should start of a Thrusday and end on the following wednesday. What is the best way to handle a week not starting on a Sunday?

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write a scaler function that returns the week number you want and use that in your select and group by.  use a case or if statement in the function to adjust the date based on start of week day.  Let me know if you'd like help with a function to do that.
actually you can do it inline
Datepart(dw, DATEADD(d,3,DateField) )-- change 3 to whatever number of days past or before sunday you need

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