https://developer.android.com/reference/kotlin/java/util/GregorianCalendar?authuser=0
GregorianCalendar | API reference | Android Developers
api referenceandroiddevelopers
https://learn.microsoft.com/en-gb/dotnet/api/system.globalization.gregoriancalendar.getera?view=netframework-4.8.1&viewFallbackFrom=net-9.0
GregorianCalendar.GetEra(DateTime) Method (System.Globalization) | Microsoft Learn
Returns the era in the specified DateTime.
datetimemethodsystemglobalizationmicrosoft
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