FA-77258 / Calendar recurrence rules / Member archive

Rendering a recurrence rule as a human-readable sentence: day order · case 03

BYDAY=MO,WE,FR is rendered as "Friday, Monday and Wednesday".

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Case contract

House style: "every <unit>" for interval 1, else "every <n> <unit>s"; weekday lists are in Monday-first order without duplicates and joined as "A, B and C"; the exact set MO..FR renders as "on weekdays"; an ordinal renders "on the 2nd Tuesday", -1 as "on the last Friday" and -n (n>1) as "on the 2nd to last Friday"; count renders ", once" for 1 and ", <n> times" otherwise.

Why this case matters

Recurring calendar series are expanded into concrete instances for display, reminders and conflict checks.

One recorded failure

Sample boundary fixture

This sample comes from the broken implementation of a controlled reproducer.

Boundary fixture	Actual	Expected	Outcome
five days with saturday	`"every week on Monday, Saturday, Thursday, Tuesday and Wednesday"`	`"every week on Monday, Tuesday, Wednesday, Thursday and Saturday"`	Failed

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