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Convert a value between units of measure: mass (g, kg, mg, lb, oz, t, st), length (m, km, cm, mm, in, ft, yd, mi), volum

List the official holidays for a country and year, with exact observed dates including substitute days (e.g. a Saturday

Holiday-aware business-day calculator for 200+ countries. Three modes: pass start + addDays (signed integer) to shift a

Airports within a radius of a coordinate, sorted by distance. Query: lat (-90..90), lon (-180..180), radius_km (1-2000,

Fetch the authoritative current text of any United States Code section by title and section number — for example title 1