Group by 7 day period on DataStudio related to current date

Question

I need to group dates by week, but relative to the current date, I can't use the "Yearweek" dimension because it always starts on Sunday/Monday and I need more flexibility.

I have come up with kind of a solution, like this:

WHEN Date = DATETIME_SUB(TODAY(), INTERVAL 3 DAY) THEN "Week 1"
WHEN Date = DATETIME_SUB(TODAY(), INTERVAL 4 DAY) THEN "Week 1"
WHEN Date = DATETIME_SUB(TODAY(), INTERVAL 5 DAY) THEN "Week 1"
(...)
WHEN Date = DATETIME_SUB(TODAY(), INTERVAL 31 DAY) THEN "Week 4"
END

You get the idea...

Is there a more "elegant" way to do this? What if I need 8 weeks? Do I really need to extend this to 56 days?

Edit: I added an editable Looker Studio whit this rule to show you, and the correspondent sheets .

This is what I get, this works absolutely fine, I was just wondering if there was a better way to do it.

Answer 1

It was as easy as

when DATE_DIFF(TODAY(), Date) >= 3 and DATE_DIFF(TODAY(), Date) <= 9 then "Week 1"

and so on...