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Intl.dateTimeFormat.resolvedOptions

The Intl.DateTimeFormat.prototype.resolvedOptions() method returns a new object with properties reflecting the locale and date and time formatting options computed during initialization of this DateTimeFormat object.

Syntax

dateTimeFormat.resolvedOptions()

Return value

A new object with properties reflecting the locale and date and time formatting options computed during the initialization of the given DateTimeFormat object.

Description

The resulting object has the following properties:

locale
The BCP 47 language tag for the locale actually used. If any Unicode extension values were requested in the input BCP 47 language tag that led to this locale, the key-value pairs that were requested and are supported for this locale are included in locale.
calendar
E.g. "gregory"
numberingSystem
The values requested using the Unicode extension keys "ca" and "nu" or filled in as default values.
timeZone
The value provided for this property in the options argument; undefined (representing the runtime's default time zone) if none was provided. Warning: Applications should not rely on undefined being returned, as future versions may return a String value identifying the runtime’s default time zone instead.
hour12
The value provided for this property in the options argument or filled in as a default.
weekday
era
year
month
day
hour
minute
second
timeZoneName
The values resulting from format matching between the corresponding properties in the options argument and the available combinations and representations for date-time formatting in the selected locale. Some of these properties may not be present, indicating that the corresponding components will not be represented in formatted output.

Examples

Using the resolvedOptions method

var germanFakeRegion = new Intl.DateTimeFormat('de-XX', { timeZone: 'UTC' });
var usedOptions = germanFakeRegion.resolvedOptions();

usedOptions.locale;          // "de"
usedOptions.calendar;        // "gregory"
usedOptions.numberingSystem; // "latn"
usedOptions.timeZone;        // "UTC"
usedOptions.month;           // "numeric"

Specifications

Browser compatibilityUpdate compatibility data on GitHub

Desktop
Chrome Edge Firefox Internet Explorer Opera Safari
resolvedOptions 24 12 29 11 15 10
computed timeZone 35 14 53 No 30 10
Mobile
Android webview Chrome for Android Firefox for Android Opera for Android Safari on iOS Samsung Internet
resolvedOptions 4.4 25 56 14 10 1.5
computed timeZone ≤37 35 56 22 10 3.0
Server
Node.js
resolvedOptions 0.12
0.12
Before version 13.0.0, only the locale data for en-US is available by default. See the DateTimeFormat() constructor for more details.
computed timeZone 8.10.0

See also

© 2005–2018 Mozilla Developer Network and individual contributors.
Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://wiki.developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Intl/DateTimeFormat/resolvedOptions