Intl.Locale.prototype.calendar

The calendar property returns the part of the Locale that indicates the Locale's calendar era. While most of the world uses the Gregorian calendar, there are several regional calendar eras used around the world. The following table shows all the valid Unicode calendar key strings, along with a description of the calendar era they represent.

buddhist

Thai Buddhist calendar

chinese

Traditional Chinese calendar

coptic

Coptic calendar

dangi

Traditional Korean calendar

ethioaa

Ethiopic calendar, Amete Alem (epoch approx. 5493 B.C.E)

ethiopic

Ethiopic calendar, Amete Mihret (epoch approx, 8 C.E.)

gregory

Gregorian calendar

hebrew

Traditional Hebrew calendar

indian

Indian calendar

islamic

Islamic calendar

islamic-umalqura

Islamic calendar, Umm al-Qura

islamic-tbla

Islamic calendar, tabular (intercalary years [2,5,7,10,13,16,18,21,24,26,29] - astronomical epoch)

islamic-civil

Islamic calendar, tabular (intercalary years [2,5,7,10,13,16,18,21,24,26,29] - civil epoch)

islamic-rgsa

Islamic calendar, Saudi Arabia sighting

iso8601

ISO calendar (Gregorian calendar using the ISO 8601 calendar week rules)

japanese

Japanese Imperial calendar

persian

Persian calendar

roc

Minguo Calendar (Republic of China)

islamicc

Civil (algorithmic) Arabic calendar

Warning: The islamicc calendar key has been deprecated. Please use islamic-civil.

Calendar eras fall under the category of locale key "extension keys". These keys add additional data about the locale, and are added to locale identifiers by using the -u extension. Thus, the calendar era type can be added to the initial locale identifier string that is passed into the Intl.Locale constructor. To add the calendar type, first add the -u extension to the string. Next, add the -ca extension to indicate that you are adding a calendar type. Finally, add the calendar era to the string.

let locale = new Intl.Locale("fr-FR-u-ca-buddhist");
console.log(locale.calendar); // Prints "buddhist"

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

let locale = new Intl.Locale("fr-FR", { calendar: "buddhist" });
console.log(locale.calendar); // Prints "buddhist"

• Intl.Locale
• Unicode Calendar Identifiers