Dating of easter
The Resurrection, then, was observed two days later, on 16 Nisan, regardless of the day of the week.In the West the Resurrection of Jesus was celebrated on the first day of the week, Sunday, when Jesus had risen from the dead.The date for Easter shifts every year within the Christian calendar.The Gregorian Calendar used by most Western Christian churches is the standard international calendar for civil use.
These tables were revised during the following few centuries resulting, eventually in the tables constructed by the 6th century Abbot of Scythia, Dionysius Exiguus.
Universal adoption of this Gregorian calendar occurred slowly.
By the 1700's, though, most of western Europe had adopted the Gregorian Calendar.
Jesus Christ on the third day after his Crucifixion.
The earliest recorded observance of an Easter celebration comes from the 2nd century, though the commemoration of Jesus’ Resurrection probably occurred earlier., is of uncertain origin.
At that time the Roman world used the Julian Calendar (put in place by Julius Caesar).