How do you calculate which day of the week any given date is?

I’m trying to make a calendar, but I can’t find a way to get what day starts a month, how would I do it?

looks like this. i opted for zellers congruence but there’s another method called doomsday BUT it seems far more convoluted IMO

you can check it out in a custom component
https://x.thunkable.com/component/659eca71a49469080acbcb97/

this algorithm is part of a calendar. first i find the day of the week for the first of the month. backfill the previous days, and generate the rest of the weeks for that month. then i return that array of arrays to the cloning section and generate the days/weeks in the visual UI


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