public enum IsoEra
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An era in the ISO calendar system.

The ISO-8601 standard does not define eras. A definition has therefore been created with two eras - 'Current era' (CE) for years on or after 0001-01-01 (ISO), and 'Before current era' (BCE) for years before that.
ISO years and eras
year-of-era era proleptic-year

Do not use ordinal() to obtain the numeric representation of IsoEra. Use getValue() instead.

extends Enum<IsoEra> implements Era

Since:  1.8

@implSpec This is an immutable and thread-safe enum.