@ende/datetime

ende add jsr:@ende/datetime

Version 2026.10.15 on JSR.

Utilities for dealing with Date objects.

import { dayOfYear, isLeap, difference, HOUR, MINUTE, SECOND } from "@ende/datetime";
import { assertEquals } from "@ende/assert";

assertEquals(dayOfYear(new Date("2019-03-11T03:24:00")), 70);
assertEquals(isLeap(1970), false);

const date0 = new Date("2018-05-14");
const date1 = new Date("2020-05-13");
assertEquals(difference(date0, date1).years, 1);

assertEquals(HOUR / MINUTE, 60);
assertEquals(MINUTE / SECOND, 60);