In my analysis filter I need a range over three month exactly.

With this formular I get the last day of the preceding month:

ADD_DAYS(ROUND_MONTH(TODAY()), -1)

Today: 07.06.2021

Result: 31.05.2021

This is the secound part of the BETWEEN order.

Now I'm searching for the first formular in the BETWEEN order

sImilar to VBA: DateSerial(YEAR(Date()),MONTH(Date())-3,1)

Is there a chance?