A string containing the abbreviated name of the specified era, if an abbreviation exists.
-or-
A string containing the full name of the era, if an abbreviation does not exist.
The era name is the name a calendar uses to refer to a period of time reckoned from a fixed point or event. For example, "A.D." or "C.E." is the current era in the Gregorian calendar.
The valid values for era are listed in the Calendar.Eras property of the appropriate class derived from System.Globalization.Calendar. For example: JapaneseCalendar.Eras displays a list of eras that are supported by this implementation.
In the System.Globalization.JapaneseCalendar class, the abbreviated era name is the first character of the full era name. This character is either the single-character case-insensitive Latin alphabet abbreviation or the single-character Kanji abbreviation.