Merely because I have set up a locale, you should by no means consider that I have systematically consulted all the relevant calendars. Also, because the earlier versions of this program did not use locales, there are still feasts that show up in all locales that really should be limited to narrower regions. The Eastern locale is particularly scanty at the moment, but it's next on my list of locales to add. If anyone would care to send me a systematic list of feasts in any particular use I would be extremely grateful. As of version 1.3, the program can handle both Old Style and New Style dating.
Some types are undifferentiated.
These feast types are bound to the feast itself, not the locale-dependent rules, so characteristics that are specific to one church or another will be included no matter what locale you have selected. Precedence and Transference Feasts vary in importance, but one major limitation of the current program is that it does not calculate precedence rules. These rules sometimes require the omission or transference of a feast if it conflicts with a more important one. The rules, and indeed the relative importance of different feasts, vary over locale and time. It is possible I will add this feature in the future, if I can track down sufficient historical data about past rules.