Editing Module:Japanese calendar/doc (section)

==== Methods ====
Era objects have three methods. Methods can be specified with the colon syntax:

* <code lang="lua">local nextEra = myEra:getNextEra()</code>

The methods are as follows:
* <code lang="lua">era:getNextEra()</code> - gets the era object for the next era. Returns <code>nil</code> if it doesn't exist.
* <code lang="lua">era:getPreviousEra()</code> - gets the era object for the previous era. Returns <code>nil</code> if it doesn't exist.
* <code lang="lua">era:getOldEra()</code> - gets the era object for the "old" era. This is the same as the current era object unless eraYear equals 1. If eraYear equals 1 then this returns the era object for the previous era. If the module could not find a valid previous era object then the current era object is returned.

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