I hear you in regards to the difficulty, and I completely agree. I've been playing the Elder Scrolls games for years, and yet their calender is still a mystery to me. However, I am kind of between a rock and a hard place on this one. Due to lore reasons, the power of Moon Clerics varies with the phases of the moon. If I stuck with the real world calender, that would cause all sorts of problems and needless difficulty. However, with a lunar calender, the phases fall on the same days each month, hopefully making it easier to deal with.
Hmm. Those are some decent suggestions. I'll think about it when I wake up a bit more.