Intl.DateTimeFormat.prototype.resolvedOptions
Returns a new object with properties reflecting the locale and date/time formatting options computed during initialization
Syntax
dateTimeFormat.resolvedOptions()Return Value
An object with resolved locale and formatting options
Examples
const fmt = new Intl.DateTimeFormat('en-US', { dateStyle: 'full' })
const opts = fmt.resolvedOptions()
console.log(opts.locale, opts.calendar, opts.timeZone)function getUserTimezone(): string {
return new Intl.DateTimeFormat().resolvedOptions().timeZone
}const fmt = new Intl.DateTimeFormat('ja-JP-u-ca-japanese')
const { calendar, locale } = fmt.resolvedOptions()
console.log(calendar) // 'japanese'
console.log(locale) // 'ja-JP-u-ca-japanese'Understanding Intl.DateTimeFormat.prototype.resolvedOptions
The Intl.DateTimeFormat.prototype.resolvedOptions method in JavaScript returns a new object with properties reflecting the locale and date/time formatting options computed during initialization. It belongs to the Intl.DateTimeFormat object and is one of the most widely used methods for working with intl.datetimeformat values in modern JavaScript and TypeScript applications.
The method signature is dateTimeFormat.resolvedOptions(). When called, it returns an object with resolved locale and formatting options. Understanding when and how to use resolvedOptions() helps you write more expressive, readable code.
Common use cases for Intl.DateTimeFormat.prototype.resolvedOptions include data transformation, input validation, API response processing, and building reusable utility functions. It works well alongside related methods like intl-datetimeformat, intl-datetimeformat-format, intl-numberformat-resolvedoptions, enabling you to chain operations together for complex data manipulation pipelines.
Browser support for Intl.DateTimeFormat.prototype.resolvedOptions is excellent across all modern browsers including Chrome, Firefox, Safari, and Edge. It is also fully supported in Node.js and Deno. For older environments, transpilation with Babel or a polyfill may be needed.
Browser Compatibility
Supported in all modern browsers (Chrome, Firefox, Safari, Edge) and Node.js. Part of the ECMAScript standard.
Related Methods
Intl.DateTimeFormatCreates an Intl.DateTimeFormat object that enables language-sensitive date and time formatting
Intl.DateTimeFormat.prototype.formatFormats a date according to the locale and formatting options of this Intl.DateTimeFormat object
Intl.NumberFormat.prototype.resolvedOptionsReturns a new object with properties reflecting the locale and number formatting options computed during initialization
More Intl.DateTimeFormat Methods
Other methods in the Intl.DateTimeFormat object
Related Tools
More Intl.DateTimeFormat Methods
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