Easter is a traditional festival in the west. In 325 AD, the Nicaean religious conference stipulated that the first Sunday after the full moon at the vernal equinox was Easter. It is a religious memorial day for Christians, aiming at commemorating the day when Jesus Christ was resurrected on the third day after being crucified between 30 and 33 AD, symbolizing rebirth and hope. Its date is not fixed, usually you have to look at the calendar to know.

In the old calendar, Easter usually falls between March 22 and April 23, depending on the vernal equinox or the full moon that appears later.