date

@nick/is/date

isDate

Signature

function isDate(it: unknown): it is Date;

Checks if a given value is a Date instance. This is a more reliable check than it instanceof Date because it also works across different realms.

This only returns true for values that are valid Date instances, meaning Object.create(Date.prototype) and similar constructs will return false.

Parameters

Name	Info
it	The value to check.

Returns

true if the value is a Date instance, false otherwise.

Category

Standard

Examples

import { isDate } from "jsr:@nick/is/date";

isDate(new Date()); // true
isDate(new Date(0)); // true
isDate(new Date("2021-01-01")); // true