Recurrency notation RFC-5545

I learn about the https://datatracker.ietf.org/doc/html/rfc5545

From the specification:

This document defines the iCalendar data format for representing and exchanging calendaring and scheduling information such as events, to-dos, journal entries, and free/busy information, independent of any particular calendar service or protocol.

really interesting RFC, it defines recurrency with a machine parseable string so we can defien something like every Friday for 6 times using a standard notation:

RRULE:FREQ=WEEKLY;BYDAY=FR;COUNT=6

And, of course, there are libraries already for that:

JS: rrule.js
Go: rrule-go

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