isLeapSecond

Signature

isLeapSecond(value: string): boolean

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

Return true if the provided string is a valid ISO 8601 leap second datetime.

• Validates leap second format using regex: “YYYY-MM-DDT23:59:60Z” or “YYYY-MM-DDT23:59:60+00:00”.
• Accepts optional fractional seconds.

Parameters

Parameter	Type	Description
value	string	ISO datetime string

Returns

boolean indicating whether the input string is a valid leap second datetime

Examples

isLeapSecond("2024-12-31T23:59:60Z") // true
isLeapSecond("2024-12-31T23:59:60.123Z") // true
isLeapSecond("2024-12-31T23:59:60+00:00") // true
isLeapSecond("2024-12-31T23:59:60.123+00:00") // true
isLeapSecond("2024-12-31T23:59:59Z") // false

Source

plain/validate/isLeapSecond.ts