FA-62175 / Currency rounding and FX conversion / Member archive

USDCAD is settled T+2 like other pairs · case 05

USDCAD trades settle a business day late.

Member previewVariant 5 · 3 implementations · 8 checks per implementation

Case contract

solve(trade, pair, holidays): stipulated spot value-date rule. USDCAD/CADUSD settle T+1, every other pair T+2. Count forward from the trade date: a day before the final one counts only if it is a weekday and not a holiday of the non-USD currencies of the pair; the value date itself must be a weekday that is a holiday in neither currency. holidays maps currency to ISO date strings. Return the ISO value date.

Why this case matters

Currency amounts must be rounded at the right stage and in the right unit, or ledgers, quotes and settlements drift by minor units.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
regression cad-settlement-lag 1	`"2026-08-12"`	`"2026-08-11"`	Failed

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