isValidZonedInterval

Signature

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

Return true if start and end form a valid zoned interval — both valid ISO ZonedDateTime strings (isValidZonedDateTime) and the instant at start is <= the instant at end.

• Both inputs must be valid ISO 8601 zoned datetime strings.
• Equal start === end is valid.
• Comparison is done by instant, so intervals spanning DST transitions are compared by absolute time.
• Reads RFC 9557 annotations as isValidZonedDateTime does: [u-ca=iso8601] and elective annotations ([foo=bar]) are accepted, an unknown critical annotation ([!foo=bar]) is rejected, and a non-ISO calendar is isValidCalendarZonedInterval’s input.
• Invalid input, malformed strings, or leap-second strings return false.

Parameters

Parameter	Type	Description
start	string	ISO ZonedDateTime string (interval start)
end	string	ISO ZonedDateTime string (interval end)

Returns

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

Examples

import { isValidZonedInterval } from "@northguild/gmt/zoned/interval";

isValidZonedInterval("2024-01-01T10:00:00+00:00[UTC]", "2024-12-31T23:59:59+00:00[UTC]") // true

startend

output

 

Source

zoned/interval/validate/isValidZonedInterval.ts