How to exclude current month from question?

I’m producing a dashboard to show YTD financial figures, but I want to exclude the current month so only complete months’ data get aggregated. I can do this using SQL, but I’m trying to do it using a ‘Question’ (cos of the data model it analyses). I don’t want to have to go in every month and edit the date ranges, I’d like it to just automatically exclude the current month. I can include the current month, I just can’t find a way to exclude it. If you could make it possible to select a timeframe and say ‘NOT’ this timeframe, that would solve the problem for me.

The default for dashboard filters for previous months doesn’t include the current month unless you flip the checkbox. You should be able to set the filter to “previous 1 month” and get what you want.