"Joke" on Google

Easter Sunday is on the 12th of April this year, but deciding which date Easter should fall on is complicated. Christian churches use March 21 as the starting point, from which they then find the Sunday after the first full moon on or after the day of the vernal equinox. Because of the different calendars used by different faiths, for example Eastern Orthodox churches use the Julian calendar instead of the Gregorian calendar and to prevent any differences in the dating of Easter, the Catholic Church has compiled tables for Easter, and all affiliated churches celebrate Easter in accordance with these tables.

Lili.