# `Calendrical.Era`

Encapsulates the era information for
known CLDR calendars.

The [era data in CLDR](https://github.com/unicode-org/cldr/blob/master/common/supplemental/supplementalData.xml)
is presented in different calendars at different times. The current
best understanding is:

### Japanese Calendar

* From Taisho (1912), the date is Gregorian year,
  month and day.

* For Tenshō (Momoyama period) to Meji era (1868)
  inclusive its Gregorian year but lunar month and day.

* For earlier eras it is Julian year with lunar month and
  day (but the Julian and Gregorian years coincide; there are
  no era dates where the Gregorian year would be different
  to the Julian year).

### Other Calendars

* For Chinese and Korean (dangi) the era dates are
  Gregorian year with lunar month and lunar day

* For Coptic, Ethiopic and Islamic calendars the eras are
  Julian dates (Julian day, month and year).

* Persian era is Julian year with persian month and day.

* Gregorian is, well, Gregorian date.

# `era_module`

Return the era module for a given
cldr calendar type.

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*Consult [api-reference.md](api-reference.md) for complete listing*