In r50778 the http://en.wikipedia.org/wiki/Minguo_calendar of Taiwan has been implemented.
An excellent reuse of code could be had here by now also implementing the
http://en.wikipedia.org/wiki/Juche#Calendar of North Korea, as it is the
exactly the same as Taiwan's (year 98=2009).
While you are at it, consider implementing
http://en.wikipedia.org/wiki/Japanese_era_name , as the article says
"Japanese era names are still in use. Government offices usually require
era names and years for official papers."
So just as here in Taiwan, one can imagine many government etc. offices where
they would be overjoyed to be able to use such dates.
As I am very much not the right man for this job, I would like to leave this bug
in the system to give others an opportunity to evaluate and/or implement it.