isValidDateTimeInterval

Signature

isValidDateTimeInterval(start: string, end: string): boolean

Return true if start and end form a valid datetime interval — both parseable as ISO PlainDateTime strings and start <= end.

• Both inputs must be ISO 8601 datetime strings (e.g. "2024-01-01T10:00:00").
• Equal start === end is valid.
• Invalid input, malformed strings, or leap-second strings return false.
• Each endpoint must satisfy isValidDateTime, so annotations are read as Temporal reads them: a time zone annotation ([Europe/Paris]), [u-ca=iso8601] and an elective annotation ([foo=bar]) are ignored; an unknown critical annotation ([!foo=bar]) and a non-ISO calendar is rejected.

Parameters

Parameter	Type	Description
start	string	ISO 8601 datetime string (interval start)
end	string	ISO 8601 datetime string (interval end)

Returns

true if start and end form a valid datetime interval, or false on invalid input

Examples

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

isValidDateTimeInterval("2024-01-01T10:00:00", "2024-12-31T23:59:59") // true

startend

output

 

Source

plain/interval/validate/isValidDateTimeInterval.ts