Range

Chronos.range(a, b) wraps a start–end pair for one expression, so it can be checked against another range of the same type:

Chronos.range(checkIn, checkOut).overlaps(opens, closes);

Chronos.range(a: T, b: T): Range<T>

a and b may come in either order, and so may the bounds of the range it is checked against. A range whose ends are equal is that one moment, and behaves as Chronos(value) does.

Throws a TypeError if a is not a supported Temporal type, or b is not of a's type.

overlaps

overlaps(from: T, to: T, options?: BetweenOptions<T>): boolean

Whether the receiver shares a moment with from–to. By default, ranges that only touch, such as 09–10 and 10–11, do not overlap:

const at = (time: string) => Temporal.PlainDateTime.from(`2026-10-06T${time}`);

Chronos.range(at("09:00"), at("10:00")).overlaps(at("10:00"), at("11:00")); // false
Chronos.range(at("09:00"), at("10:00")).overlaps(at("10:00"), at("11:00"), {
  inclusive: true,
}); // true

isBetween

isBetween(from: T, to: T, options?: BetweenOptions<T>): boolean

Whether the whole receiver range lies between from and to.

Chronos.range(at("09:00"), at("10:00")).isBetween(at("08:00"), at("11:00")); // true

Options

Both methods take the options of isBetween: bounds are excluded unless inclusive, includeStart or includeEnd say otherwise, and unit compares by unit.