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Try Addmonths()
For eg. Addmonths(max(<Date Field>),-1) will give you previous of month selected
The following Design Blog links may provide some further ideas too:
https://community.qlik.com/t5/Qlik-Design-Blog/A-Primer-on-Set-Analysis/ba-p/1468344
https://community.qlik.com/t5/Qlik-Design-Blog/Dates-in-Set-Analysis/ba-p/1472511
Regards,
Brett