intervalDifferenceTime

Signature

intervalDifferenceTime(aStart: string, aEnd: string, bStart: string, bEnd: string): { start: string; end: string; }[]

import { intervalDifferenceTime } from "@northguild/gmt/plain/interval";

Return the portion(s) of interval A not covered by interval B.

• Uses Temporal.PlainTime.compare for comparison.
• Returns [] when B fully covers A.
• Returns [{ start, end }] when B overlaps one edge of A (or equals A).
• Returns [{ start, end }, { start, end }] when B is fully inside A with gaps on both sides.
• Returns [] if either interval is invalid (start > end).
• Returns [] on invalid input (wrong type, malformed strings).

Parameters

Parameter	Type	Description
aStart	string	ISO 8601 time string for the first interval start
aEnd	string	ISO 8601 time string for the first interval end
bStart	string	ISO 8601 time string for the second interval start
bEnd	string	ISO 8601 time string for the second interval end

Returns

array of { start, end } records representing A minus B, or [] on invalid input

Examples

intervalDifferenceTime("09:00:00", "17:00:00", "12:00:00", "13:00:00") // [{ start: "09:00:00", end: "11:59:59" }, { start: "13:00:01", end: "17:00:00" }]
intervalDifferenceTime("09:00:00", "17:00:00", "09:00:00", "17:00:00") // []
intervalDifferenceTime("09:00:00", "17:00:00", "12:00:00", "17:00:00") // [{ start: "09:00:00", end: "11:59:59" }]
intervalDifferenceTime("invalid", "17:00:00", "12:00:00", "13:00:00") // []

Source

plain/interval/intervalDifferenceTime.ts