The Islamic Umm al-Qura calendar used in Saudi Arabia. This is based on astronomical calculation, instead of tabular behavior.
case islamicUmmAlQuras20FoundationEssentials8CalendarV10IdentifierO16islamicUmmAlQurayA2EmF What are these?9MM02import FoundationEssentialsenum IdentifierCalendar supports many different kinds of calendars. Each is identified by an identifier here.
struct CalendarCalendar encapsulates information about systems of reckoning time in which the beginning, length, and divisions of a year are defined. It provides information about the calendar and support for calendrical computations such as determining the range of a given calendrical unit and adding units to a given absolute time.
case buddhistcase chinesecase copticcase ethiopicAmeteAlemcase ethiopicAmeteMihretcase gregorianThe common calendar in Europe, the Western Hemisphere, and elsewhere.
case hebrewcase indiancase islamiccase islamicCivilcase islamicTabularA simple tabular Islamic calendar using the astronomical/Thursday epoch of CE 622 July 15
case iso8601case japanesecase persiancase republicOfChina