None.

An array of strings representing all calendars commonly used for the Locale, sorted in descending preference. If the Locale already has a calendar, then the returned array contains that single value.

Below is a list of the supported calendar era types.

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

Civil (algorithmic) Arabic calendar

islamicc

Civil (algorithmic) Arabic calendar

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

If the Locale object doesn't have a calendar already, getCalendars() lists all commonly-used calendars for the given Locale. For examples of explicitly setting a calendar, see calendar examples.

const arEG = new Intl.Locale("ar-EG");
console.log(arEG.getCalendars()); // ["gregory", "coptic", "islamic", "islamic-civil", "islamic-tbla"]

const jaJP = new Intl.Locale("ja-JP");
console.log(jaJP.getCalendars()); // ["gregory", "japanese"]

• Intl.Locale
• Intl.Locale.prototype.calendar
• Unicode Calendar Identifier in the Unicode locale data markup language spec