The Intl.Locale.prototype.hourCycle property is an accessor property that returns the time keeping format convention used by the locale.


There are 2 main types of time keeping conventions (clocks) used around the world: the 12 hour clock and the 24 hour clock. The hourCycle property makes it easier for JavaScript programmers to access the clock type used by a particular locale. Like other additional locale data, hour cycle type is an extension subtag, which extends the data contained in a locale string. The hour cycle type can have several different values, which are listed in the table below.

Valid hour cycle types

Hour cycle type Description
h12 Hour system using 1–12; corresponds to 'h' in patterns. The 12 hour clock, with midnight starting at 12:00 am.
h23 Hour system using 0–23; corresponds to 'H' in patterns. The 24 hour clock, with midnight starting at 0:00.
h11 Hour system using 0–11; corresponds to 'K' in patterns. The 12 hour clock, with midnight starting at 0:00 am.
h24 Hour system using 1–24; corresponds to 'k' in pattern. The 24 hour clock, with midnight starting at 24:00.


These examples will show you how to add hour cycle data to your Locale object.

Adding an hour cycle via the locale string

In the Unicode locale string spec, the hour cycle is a locale string "extension subtag". These subtags add additional data about the locale, and are added to locale identifiers by using the -u extension key. Thus, the hour cycle type can be added to the inital locale identifier string that is passed into the Locale constructor. To add the hour cycle type, first add the -u extension key to the string. Next, add the -hc extension key to indicate that you are adding an hour cycle. Finally, add the hour cycle type to the string.

let fr24hour = new Intl.Locale("fr-FR-u-hc-h23");
console.log(fr24hour.hourCycle); // Prints "h23"

Adding an hour cycle via the configuration object argument

The Intl.Locale constructor has an optional configuration object argument, which can contain any of several extension types, including hour cycle types. Set the hourCycle property of the configuration object to your desired hour cycle type, and then pass it into the constructor.

let us12hour = new Intl.Locale("en-US", {hourCycle: "h12"});
console.log(us12hour.hourCycle); // Prints "h12"


ECMAScript Internationalization API (ECMA-402)

Browser compatibility

Update compatibility data on GitHub
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidFirefox for AndroidOpera for AndroidSafari on iOSSamsung InternetNode.js
hourCycleChrome Full support 74Edge Full support 79Firefox Full support 75IE No support NoOpera Full support 62Safari Full support 14WebView Android Full support 74Chrome Android Full support 74Firefox Android No support NoOpera Android Full support 53Safari iOS Full support 14Samsung Internet Android Full support 11.0nodejs Full support 12.0.0
Full support 12.0.0
Notes Before version 13.0.0, only the locale data for en-US is available by default. See the Locale() constructor for more details.


Full support  
Full support
No support  
No support
See implementation notes.
See implementation notes.

See also