I think the calendar problem is an entirely different subject that would warrant it's own article. I suppose what you could do is look up the calendar for each

I think the calendar problem is an entirely different subject that would warrant it's own article. I suppose what you could do is look up the calendar for each historical report of the event and then convert it to a single calendar. https://en.wikipedia.org/wiki/List_of_calendars https://en.wikipedia.org/wiki/List_of_calendars