public interface CalendarEra
Represents an era in a calendar system.
An era is date-related and defines a reference date which can be
interpreted as start or end of an era. Not all calendar systems know
an era concept, however. Especially all ISO-calendar systems have no
era according to ISO-8601-standard. If an era exists in a given
calendar system then the meaning of a year changes such that it
means the year of an era counting as positive number from
Yields the canonical non-localized name.
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