isLeapYear

Signature

isLeapYear(value: string): boolean

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

Return true when the given PlainDate falls in a leap year.

• A leap year is divisible by 4, except for century years which must be divisible by 400.
• Returns false for invalid input strings.

Parameters

Parameter	Type	Description
value	string	ISO PlainDate string

Returns

boolean indicating whether the date is in a leap year

Examples

isLeapYear("2024-03-15") // true
isLeapYear("2023-03-15") // false
isLeapYear("invalid") // false

Source

plain/validate/isLeapYear.ts