Examples / Lengths of time

Countdown to a launch

The time left until Friday at 5 PM, as a duration you can print three ways. until() does the subtraction and keeps the units.

Try this

Watch the seconds. Each tick asks now().until(launch) again and prints what comes back.
Change 'friday' to 'monday' in app.js. The launch moves, and so does the count.
Pick Asia/Tokyo in the preview’s bar. Friday at 5 PM comes sooner there, so less time is left.

import { now, today } from 'native-dates';

const launch = today().next('friday').at('5pm');

document.querySelector('#launch').textContent = launch.format('full');

function tick() {
  const left = now().until(launch).round('second');
  document.querySelector('#long').textContent = left.format();
  document.querySelector('#narrow').textContent = left.format('narrow');
  document.querySelector('#digital').textContent = left.format('digital');
}

setInterval(tick, 1000);
tick();

Zone

Starting…

How it works

today().next('friday').at('5pm') reads as the sentence it is: the next Friday after today, at five in the afternoon, here. until() returns a Duration whose parts are already balanced into days, hours, minutes and seconds, so there is no dividing by 86,400,000.

format() prints a duration in the reader’s language. 'narrow' and 'digital' are the same duration in tighter forms.