filter on date

[steve]

Hi,

I receive every day pdf reports. I have now more than 1800 mails, which
takes a lot of space. Every first day of the month, the report is a
summary of the month, and I would like to only keep those one.

I know how to filter mail using ~d. But that's only for one specific
day. I tried something like

~d 1/*/* but got 'invalid month */*'

Also tried

~d 1/[1-12]/2022 but got 'invalid month [1-12]/2022'

How could I do?

Thanks,

s.