Evolution of Christian calendar from Julian to Gregorian system

Evolution of Christian calendar from Julian to Gregorian system. Julian calendar created in 45 BCE by Julius Caesar with 365 days and 12 months Julian calendar start date was 753 BCE marking the founding of Rome Byzantine monk Dionysius Exiguus changed the calendar start date in 525 CE from founding of Rome to birth of Christ, a shift of 753 years

Julius Caesar created the Julian calendar in 45 BCE with 365 days. In 525 CE, monk Dionysius Exiguus shifted the start date to Christ's birth. Pope Gregory XIII corrected a 10-day drift in 1582 🗓️

Key Facts

• Julian calendar created in 45 BCE by Julius Caesar with 365 days and 12 months
• Julian calendar start date was 753 BCE marking the founding of Rome
• Byzantine monk Dionysius Exiguus changed the calendar start date in 525 CE from founding of Rome to birth of Christ, a shift of 753 years
• English monk Bede added the BC (Before Christ) system in the 8th century to discuss histories before Christ
• Pope Gregory XIII reformed the calendar in 1582, shifting it 10 days forward to align Easter dates with spring
• Julian calendar leap year system was 365.25 days but actual year is 365.2422 days, causing drift
• Gregorian calendar became the modern standard used globally

Source: The Real Reason We Stopped Saying BC by Archaeologist Ed Barnhart