You can type in your own variables for calendars and make custom ones
The Darian calender might be too complicated, but you could come up with an approximation to it possibly.
Hi, Currently you wouldn't be able to implement the Darian calendar, as while we have custom calendars, they wouldn't allow for the leap year structure mentioned for this calendar system (if you want leap years currently they can only follow the Gregorian system, every 4 but not every 100 etc.) We are improving this in the next version, which will allow you to define different structures for leap years, however you still would not be able to implement the calendar fully, as there wouldn't be a way to implement the restarting of the days of the week each month. However after the initial release of the next version we would consider other features to add to the custom calendars, and we can add this to the list. Jess