Worked a bunch more on MfGames.Culture. Got it to parse a date string, such as "2006-01-23" and come up with the properly Julian Day. Also got it to take that JD and produce a formatted result and it worked! I now have the basics for a fantasy calendar set up. Of course, it occured to me that the IFormula is integer based when it has to be double-based for the time of day, but that is an easy fix. So, I'm very happy with myself, it works.