How do I create a week to date Tableau calculation with a Monday week start

Question

I'm working on a project where I must display several weeks of Sales, week to day. So, if today was Wednesday, all weeks displayed would show Monday, Tuesday and Wednesday. Weeks start on Monday and go to Sunday. I changed the week start in my data source settings but that did not fix my issue.

My original formula is as follows:

IF Datepart('weekday', [Date])<=DATEPART('weekday', TODAY()) THEN [Revenue] END This formula is close to what I need, but it unfortunately includes Sunday. I think this is because datepart numbers are fixed.

How can I modify this formula to show the days of the week based on a Monday start?

This formula works, but only shows me a single week (user should be able to select the last x number to weeks). IF DATEDIFF('week', DATETRUNC('week'[Date],'monday'),DATETRUNC('week',TODAY(),'monday'))=0 THEN [Sales] END

Answer 1

You could just tell it ignore Sunday (day 1). (Edit based on comments - if today is day 1 then show all). Modifying your calc:

IF DATEPART('weekday', TODAY()) = 1 THEN [Revenue] ELSEIF Datepart('weekday', [Date])>1 AND Datepart('weekday', [Date])<=DATEPART('weekday', TODAY()) THEN [Revenue] END