Stack area chart without date hierarchy

Hello,

I think you will need to add a calendar table. That's a table with an entry for every day in the date range covered by your report, and additional columns that tell what month, year, etc any given day is in.
There are many sample available. A good one is here: https://www.youtube.com/playlist?list=PL7GQQXV5Z8eczWqKFMDVoHMjTcpH3tgZm

along with a short video about how to use it

Once you have the calendar table you can relate it to your date field, and then you will be able to select the date, but also have the month values available.

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