The date of Easter varies from year to year. In the Western Christian tradition, Easter falls on the first Sunday following the first full moon that occurs on or after the vernal (spring) equinox, which is usually around March 21st. This means that Easter can occur on any Sunday between March 22nd and April 25th.
For example, Easter Sunday in 2022 will be on April 17th, while in 2023, it will be on April 9th. The Eastern Orthodox Church uses a slightly different method to calculate the date of Easter, but it usually falls on a different Sunday than the Western Christian celebration.