Editing Western Christianity (section)

=== Date of Easter ===
{{Main|Easter controversy}}
The [[Easter#Date|date of Easter]] usually differs between Eastern and Western Christianity, because the calculations are based on the [[Julian calendar]] and [[Gregorian calendar]] respectively. However, before the Council of Nicea, various dates including Jewish Passover were observed. Nicea "Romanized" the date for Easter and anathematized a "Judaized" (i.e. Passover date for) Easter. The date of observance of Easter has only differed in modern times since the promulgation of the Gregorian calendar in 1582; and further, the Western Church did not universally adopt the Gregorian calendar at once, so that for some time the dates of Easter differed between the Eastern Church and the Roman Catholic Church, but not necessarily as between the Eastern Church and the Western Protestant churches. For example, the Church of England continued to observe Easter on the same date as the Eastern Church until 1753.

Even the dates of other Christian holidays often differ between Eastern and Western Christianity.