RFC for cron system #10
Description
every 1 week on tuesday
every 1 week on wednesday
every 2 weeks on friday [needs a "starting"]
- could just interpret it as:
- do (weeks since unix epoch) % 2
- do it if that's 0
every 3 months on the 11th [needs a "starting"]
- this would be interpreted as:
- (months since unix epoch) % 3
- pick a quotient from [0,2] by …
idk. something like that. or just use a start date (that would be easier)
Schedule.Next(time.Time) can be as dumb as "evaluate the criterion against every day starting from the given time until it matches."
another way it could work is: there's a log of upcoming recurrences, and each time a recurrence is processed, we add a new instance to that log