[Cyburbia]

The standard vBuleltin calendar is great for handling holidays that occur on the same time every year, whether it's a set date such as Christmas or Independence Day, or something that takes place on an nth Monday of the month like Memorial Day and Canadian Thanksgiving.

Certian holidays, though, flat around the calendar; most Jewish holidays (mostly falling on the same day every year in the Jewish lunisolar calendar, but not the Gregorian calendar), Ramadan (consistent with the Islamic lunar calendar), Easter, and so on. Is there a calendar hack to handle these holidays?