intervalAbutsDateTime

Signature

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

Return true when two half-open datetime intervals [aStart, aEnd) and [bStart, bEnd) are exactly adjacent — one ends where the other starts, so they share nothing and leave no gap.

• Half-open: an interval holds every t with start <= t < end, so an interval’s end is the first value after it. Returns true when aEnd === bStart or bEnd === aStart (Allen’s “meets”). There is no one-nanosecond step: a one-nanosecond gap is a gap.
• An empty interval (start === end) abuts nothing.
• Uses Temporal.PlainDateTime.compare for comparison.
• Returns false when intervals overlap, are disjoint with a gap, or are invalid.
• Returns false on invalid input (wrong type, malformed strings).

Parameters

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

Returns

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

Examples

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

intervalAbutsDateTime("2024-01-01T09:00:00", "2024-01-01T12:00:00", "2024-01-01T12:00:00", "2024-01-01T17:00:00") // true

aStartaEndbStartbEnd

output

 

Source

plain/interval/intervalAbutsDateTime.ts