Format a date for the given locale

Use Intl.DateTimeFormat with an explicit locale and time zone.

JavaScript Version 1.0.0 · MIT · .md

function formatDate({ date, locale }) { return new Intl.DateTimeFormat(locale, { timeZone: 'UTC' }).format(new Date(date)); }

Try in the local lab Download function

Input & expected output

Input

{
  "date": "2026-10-28",
  "locale": "pt-BR"
}

Expected output

"28/10/2026"

The edge case

Input

{
  "date": "2026-10-28",
  "locale": "en-US"
}

Expected output

"10/28/2026"

Know the limits

timeZone: "UTC" keeps a YYYY-MM-DD date on the same day; without it a local time zone west of UTC shows the previous day.
Exact output can vary slightly between ICU versions.

The function above is the implementation used by the lab. The lab validates JSON types and caps size before execution; include equivalent validation when accepting untrusted input in your application.

Source & maintenance

Pins timeZone to UTC so a calendar date does not shift to the previous day. Original MDX retained as inert source evidence.

Maintained by Oveyon. Source commit: 14b481cf60df. Read the license.

Local fixture scope · Node.js 22.23.2 · reviewed October 28, 2026. No external service is required.

Keep exploring

Compare two dates — Compare validated ISO calendar dates in UTC and return -1, 0 or 1.
Add AM PM suffix to an hour — Turn an hour from 0 to 23 into a 12-hour label with am or pm.
Calculate the number of days between two dates — Count whole calendar days between two YYYY-MM-DD dates.