← JavaScript Essentials
Arrays, objects and data · 15 MIN

Dates, math and useful built-ins

Dates, math and useful built-ins

The Date object represents a point in time; be mindful of time zones when displaying dates. Math provides common numeric functions. Number, String and Array utilities help convert and process values.

Try it yourself

Change the example, run it, and explain the result in your own words. Then create one variation of your own.

Key idea

Use the example as a starting point, not something to memorize. Practise, inspect the result and make small improvements.

Code example

const today = new Date();
const rounded = Math.round(4.7);
console.log(today.toISOString(), rounded);