Christmas is always on the 25th of December. Thanksgiving is the third Thursday of the month of November. The dates of most holidays hold to some established criteria of date placement on the calendar. At first glance, it appears that Easter doesn't follow this rule. Some years it occurs in March - in others it happens in April. And the dates of the Easter holiday seem to fall all over the place. However, at closer look - Easter (and the period of Lent that precedes it) is also as predictable as some of the other holidays.