Easter is a movable feast: it falls on the first Sunday after the first full moon on or after the spring equinox, so the date shifts every year. This countdown automatically targets the next Easter Sunday.
Unlike Christmas, Easter has no fixed date. Western churches set it by a lunar rule tied to the spring equinox, so it can land anywhere from March 22 to April 25. Eastern Orthodox churches often calculate a different date using the Julian calendar.
For Christians, Easter marks the resurrection of Jesus and is the most important feast of the year. Culturally it brings egg hunts, the Easter Bunny, baskets of candy and spring gatherings with family.