The calendar property returns an array of all supported calendars for the Locale. The array items indicate the Locale object's calendar era. The following table shows all 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

Civil (algorithmic) Arabic calendar

islamicc

Civil (algorithmic) Arabic calendar

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

List supported calendars for a given Locale.

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

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

• Intl.Locale
• Unicode Calendar Identifiers