Easter's date is not the same day on the calendar each year.

Instead, the date is related to the moon. In simplified terms, the Paschal Full Moon is the first full moon immediately following the Vernal (Spring) Equinox in the Northern Hemisphere. In Western Christianity, Easter is always celebrated on the Sunday immediately following the Paschal Full Moon. Nevertheless, the entire story is actually a bit more complicated https://www.almanac.com/easter-paschal-full-moon The possible dates of the Paschal Full Moon range from March 21 to April 18. As a result, Easter can fall anywhere from March 22 through April 25 in Western Christianity.