isValidDate

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Signature

isValidDate(value: string): boolean

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

Return true if value is a valid ISO PlainDate string.

• Uses regex to check format before parsing.
• 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

isValidDate("2024-03-10") // true
isValidDate("2024-02-30") // false
isValidDate("invalid") // false
isValidDate("2024-12-31T23:59:60") // false (leap second - not a valid date)

Source

plain/validate/isValidDate.ts