https://learn.microsoft.com/es-es/dotnet/api/system.globalization.gregoriancalendar.calendartype?view=netframework-4.8.1&viewFallbackFrom=net-10.0
GregorianCalendar.CalendarType Property (System.Globalization) | Microsoft Learn
Gets or sets the GregorianCalendarTypes value that denotes the language version of the current GregorianCalendar.
property systemglobalizationmicrosoftlearn