Timezones in JavaScript

Timezones

JavaScript dates are stored in UTC internally but displayed in the local timezone. Use Intl.DateTimeFormat with a timeZone option to display in any timezone.

Example

// Display in a specific timezone
const d = new Date("2024-06-15T10:00:00Z"); // UTC

new Intl.DateTimeFormat("en-US", {
  timeZone: "America/New_York",
  dateStyle: "full",
  timeStyle: "long",
}).format(d);
// "Saturday, June 15, 2024 at 6:00:00 AM EDT"

new Intl.DateTimeFormat("en-US", {
  timeZone: "Asia/Tokyo",
  timeStyle: "short",
}).format(d);
// "7:00 PM" (next day in Tokyo)

JAVASCRIPT

Full Editor

Pro Tip

Store all dates in UTC (ISO strings) and convert to local timezone only at display time.

Related Resources

JavaScript Reference

Complete tag & property list

JavaScript How-To Guides

Step-by-step practical guides

JavaScript Exercises

Practice what you've learned