dates of Easter and Christmas - Adventist and Christadelphian help wanted
MJ. Smith
MVP Posts: 54,862 
After many tries, I finally got Bard to produce the following table:
[quote]
## Easter and Christmas Dates Across Diverse Calendars
| Calendar Type | Earliest Easter (Gregorian Date) | Latest Easter (Gregorian Date) | Christmas Date |
|---|---|---|---|
| Gregorian | March 22nd | April 25th | December 25th |
| Julian | March 25th (Julian) | April 28th (Julian) | December 25th (Julian) (Jan 7th Gregorian) |
| Coptic | May 4th | May 8th | January 7th |
| Ethiopian Tewahedo | April 6th | April 9th | January 7th |
| Lunar Adventist | Late March - Early April | Late April - Early May | December or January (varies) |
| Revised Julian | March 22nd | April 25th | December 25th |
| Quaker (Meeting for Worship) | No fixed date, determined by community discernment | No fixed date, determined by community discernment | No fixed date, determined by community discernment |
| Seventh-day Adventist (Lunar) | Late March - Early April | Late April - Early May | December or January (varies) |
| Christadelphian (Modified Hebrew) | Varies based on lunar calculations | Varies based on lunar calculations | Varies based on lunar calculations |
| Armenian Apostolic | April 4th - April 8th | April 7th - April 11th | January 6th |
| Malankara Orthodox Syrian | Varies based on astronomical observations | Varies based on astronomical observations | Varies (often in December or January) |
| Assyrian Church of the East | January 6th or December 25th | January 6th or December 25th | January 6th and December 25th |
Notes:
For calendars other than Gregorian, dates in parentheses are according to the original calendar, but often correspond to different dates in the Gregorian calendar due to calendar discrepancies.
Quakers and some other minor groups do not have fixed dates for Easter or Christmas, as they rely on communal discernment and spiritual guidance for scheduling worship gatherings and observances.
The Armenian Apostolic, Malankara Orthodox Syrian, and Assyrian Church of the East calendars have unique calculations for Easter and Christmas, which can result in different dates from both the Gregorian and Julian systems.
I would treat Quakers as not having a liturgical calendar. I need to research the details for the dates that are only provided in broad strokes. But I need help with the lunar calendars in use by some Adventists and Christadelphians ... anyone in the forums with the expertise to head me in the right direction?
Yes, I know Bard rather messed up on the Assyrian Church of the East.
Orthodox Bishop Alfeyev: "To be a theologian means to have experience of a personal encounter with God through prayer and worship."; Orthodox proverb: "We know where the Church is, we do not know where it is not."
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