FA-61602 / Options payoff and settlement / Member archive

Listed option expiration date calendar: a quarter-end month maps to the next quarter · case 02

March, June and September quarterly contracts expire three months late.

Member previewVariant 2 · 3 implementations · 8 checks per implementation

Case contract

Inputs year, month, kind and holidays. Monthly expiry is the third Friday of the month; quarterly expiry is the last calendar day of the quarter-end month (Mar/Jun/Sep/Dec) containing the month. Either date rolls back to the preceding business day (weekday not in holidays) when it is not a business day. Return [y,m,d].

Why this case matters

Option expiry, exercise and settlement engines move cash and shares; a wrong branch misstates obligations.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
regression quarter month mapping 1	`[2030, 6, 28]`	`[2030, 3, 29]`	Failed

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