intervalSplitAtUtc

Signature

intervalSplitAtUtc(start: string, end: string, points: string[]): { start: string; end: string; }[]

import { intervalSplitAtUtc } from "@northguild/gmt/utc/interval";

Split a UTC interval at arbitrary points, producing consecutive sub-intervals.

• points need not be sorted — they are sorted internally before splitting.
• Points outside [start, end] are dropped; they cannot introduce a boundary that isn’t inside the interval.
• Points exactly on start or end are dropped too — they would only produce a zero-length sub-interval at the edge.
• Duplicate points collapse to a single boundary.
• Returns [{ start, end }] (the whole interval, unsplit) when no valid in-range point remains.
• Returns [] when points is not an array, when any element is not a valid ISO UTC datetime string, or on invalid input (unparseable start/end, start > end, leap-second strings).

Parameters

Parameter	Type	Description
start	string	ISO UTC datetime string for the interval start
end	string	ISO UTC datetime string for the interval end
points	string[]	array of ISO UTC datetime strings to split at

Returns

array of { start, end } records, or [] on invalid input

Examples

intervalSplitAtUtc("2024-01-01T00:00:00Z", "2024-01-10T00:00:00Z", ["2024-01-05T00:00:00Z"]) // [{ start: "2024-01-01T00:00:00Z", end: "2024-01-05T00:00:00Z" }, { start: "2024-01-05T00:00:00Z", end: "2024-01-10T00:00:00Z" }]
intervalSplitAtUtc("2024-01-01T00:00:00Z", "2024-01-10T00:00:00Z", []) // [{ start: "2024-01-01T00:00:00Z", end: "2024-01-10T00:00:00Z" }]
intervalSplitAtUtc("invalid", "2024-01-10T00:00:00Z", ["2024-01-05T00:00:00Z"]) // []

Source

utc/interval/intervalSplitAtUtc.ts