intervalAbutsUtc

Signature

intervalAbutsUtc(aStart: string, aEnd: string, bStart: string, bEnd: string): boolean

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

Return true when two UTC intervals are exactly adjacent — one’s end equals the other’s

• start with zero gap and zero overlap.
• Uses Temporal.Instant.compare for comparison.
• Returns true when aEnd + 1 nanosecond === bStart or bEnd + 1 nanosecond === aStart.
• Returns false when intervals overlap, are disjoint with a gap, or are invalid.
• Returns false on invalid input (wrong type, malformed strings, leap seconds).

Parameters

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

Returns

true if intervals are exactly adjacent, or false on invalid input

Examples

intervalAbutsUtc("2024-01-01T09:00:00Z", "2024-06-30T12:00:00Z", "2024-06-30T12:00:00.000000001Z", "2024-12-31T17:00:00Z") // true
intervalAbutsUtc("2024-06-30T12:00:00Z", "2024-12-31T17:00:00Z", "2024-01-01T09:00:00Z", "2024-06-30T12:00:00.000000001Z") // true
intervalAbutsUtc("2024-01-01T09:00:00Z", "2024-06-30T12:00:00Z", "2024-06-30T12:00:01Z", "2024-12-31T17:00:00Z") // false (gap)
intervalAbutsUtc("2024-01-01T09:00:00Z", "2024-06-30T13:00:00Z", "2024-06-30T12:00:00Z", "2024-12-31T17:00:00Z") // false (overlap)
intervalAbutsUtc("invalid", "2024-06-30T12:00:00Z", "2024-06-30T12:00:00Z", "2024-12-31T17:00:00Z") // false

Source

utc/interval/intervalAbutsUtc.ts