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JavaScript Dates

A Date object holds one moment in time. Code can build a date for a fixed moment or for the current moment.

Building from parts

The parts are the year, the month, and the day. The month counts from 0, so 9 stands for October.

const day = new Date(2026, 9, 24);
console.log(day.toDateString());

A date as ISO text

toISOString writes the date in a standard text format. The time part shows midnight in UTC.

const day = new Date(2026, 9, 24);
console.log(day.toISOString());

A date is an object

A Date is an object holding one moment. Its methods turn the moment into text or parts.

const day = new Date(2026, 9, 24);
console.log(typeof day);

Example

const start = new Date(2026, 0, 1);
const end = new Date(2026, 11, 31);
console.log(start.toDateString());
console.log(end.toDateString());

Key points

  • new Date() with no arguments holds the current moment.
  • Number parts build a date in local time with no day shift.
  • The parts are the year, the month, and the day.
  • toDateString shows a date as readable text.
  • A Date is an object, and typeof reports object for it.

In this example, two dates mark the first and last days of 2026. The month part 0 stands for January and 11 stands for December. Each date is logged as readable text.

Note

A text date with no time is read as UTC midnight. Number parts avoid that shift.

Try it Yourself

Edit the code, then press Run.

Runs in your browser — the preview under the editor is the real result. Nothing is sent to a server. The code runner panel (right) does the same with more room.

Exercise

In new Date(2026, 9, 24), which month does the 9 stand for?