Calendars and time
Revised Julian Calendar
Direct answer
Revised Julian Calendar: The Revised Julian Calendar is a twentieth-century calendar reform whose leap rule closely tracks the tropical year and currently shares Gregorian civil dates.
The Revised Julian Calendar uses a refined leap rule adopted by some Eastern Orthodox churches.
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At a glance
- Found in
- Calendars & Timekeeping
- Related
- Proleptic Julian Calendar, ISO Week Date, Calendar, Julian Date
The Revised Julian Calendar uses a refined leap rule adopted by some Eastern Orthodox churches.
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The story behind Revised Julian Calendar
A congress of Orthodox churches adopted the revised system in 1923, although adoption has never been universal.
Why Revised Julian Calendar matters
Revised Julian Calendar matters because Orthodox feast dates may follow Revised Julian, Gregorian, or traditional Julian rules depending on the church and observance.
Revised Julian Calendar in practice: an example
For the present era, a fixed feast on the Revised Julian calendar falls on the same civil date as in the Gregorian calendar.
Where readings of Revised Julian Calendar go wrong
A common error is to say all Orthodox churches use the Revised Julian Calendar or confuse it with revised Easter calculations.
Sources and editorial method
Research references used for this entry include:
- U.S. Naval Observatory: Introduction to Calendars - Official overview of calendar systems, leap rules, eras, and historical calendar reform.
- Source
- The Great Almanac Dictionary
- Category
- Calendars & Timekeeping
- Last updated
- 2026-09-26
Check the church calendar rule
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Common questions
What is the Revised Julian Calendar?
The Revised Julian Calendar is a twentieth-century calendar reform whose leap rule closely tracks the tropical year and currently shares Gregorian civil dates.
What do people get wrong about the Revised Julian Calendar?
A common error is to say all Orthodox churches use the Revised Julian Calendar or confuse it with revised Easter calculations.
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