have talked about the raspberry pi dilemma some time ago, and i guess it still holds: the board is damn slow but a great toy.
we are still searching for everybody who wants to help with the arm port. the people on the sig-arm mailing list are excited to hear from you. will lead to issues.
this is simply the 0 th day of the current month is the last day of the previous month. so a date like "18/06/2021" and "00/06/2021" will be the last day of the previous month. 