isValidIsoDateLike

Signature

isValidIsoDateLike(value: string): boolean

Return true when the input is a valid PlainDate or PlainDateTime ISO string.

• Accepts both PlainDate (“2024-02-29”) and PlainDateTime (“2024-02-29T12:34:56”) formats.
• The part before the first annotation must match plainDate or plainDateTime.
• Reads RFC 9557 annotations as Temporal.PlainDate.from / Temporal.PlainDateTime.from do: elective ones and a time zone annotation are ignored, an unknown critical one is rejected, and the calendar must be ISO.
• Rejects leap seconds and invalid dates/times.

Parameters

Parameter	Type	Description
value	string	ISO PlainDate or PlainDateTime string

Returns

boolean indicating validity

Examples

import { isValidIsoDateLike } from "@northguild/gmt/plain/validate";

isValidIsoDateLike("2024-02-29") // true

value

output

 

Source

plain/validate/isValidIsoDateLike.ts