isValidDate

Signature

isValidDate(value: string): boolean

Return true if value is a valid ISO PlainDate string.

• The part before the first annotation must match plainDate (a date, not a date-time).
• Reads RFC 9557 annotations as Temporal.PlainDate.from does: elective ones ([foo=bar]) and a time zone annotation are ignored, and an unknown critical one ([!foo=bar]) is rejected. The calendar must be ISO ([u-ca=iso8601] is accepted); a non-ISO calendar is isValidCalendarDate’s input.
• Rejects leap seconds (e.g., “2024-12-31T23:59:60”).
• Rejects invalid dates (e.g., “2024-02-30”).

Parameters

Parameter	Type	Description
value	string	ISO PlainDate string

Returns

boolean indicating validity

Examples

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

isValidDate("2024-03-10") // true

value

output

 

Source

plain/validate/isValidDate.ts