FA-61204 / Bond day-count conventions / Member archive

Settlement date from a business-day lag across two calendars: the lag is added in calendar days and then rolled forward · case 04

Trades before weekends and holidays settle too early.

Member previewVariant 4 · 3 implementations · 8 checks per implementation

Case contract

Inputs a trade date (a business day), a lag n and two holiday lists. A business day is a weekday that is a holiday in neither calendar. Settlement is the n-th business day strictly after trade (trade date for n=0). Return [y,m,d].

Why this case matters

Bond accrual and pricing systems depend on exact day-count arithmetic; a single-day error changes settlement cash.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
regression calendar lag then roll 1	`[2025, 8, 6]`	`[2025, 8, 8]`	Failed

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