The faithful day/week/month/year projection of a PayZen rrule, or
undefined when none exists. Only FREQ + INTERVAL (+ COUNT, which bounds
the number of installments without changing the cadence) project; any
other part (BYDAY, BYMONTHDAY, BYSETPOS, UNTIL, …) shifts occurrences in
ways the simple interval vocabulary cannot express, so the record then
carries only schedule.
The faithful day/week/month/year projection of a PayZen rrule, or undefined when none exists. Only FREQ + INTERVAL (+ COUNT, which bounds the number of installments without changing the cadence) project; any other part (BYDAY, BYMONTHDAY, BYSETPOS, UNTIL, …) shifts occurrences in ways the simple interval vocabulary cannot express, so the record then carries only
schedule.