Difference Between Julian and Proleptic Gregorian Calendar Dates
Before the introduction of the Gregorian calendar, the difference between Julian and proleptic Gregorian calendar dates were as follows: Whenever the calendars do not have corresponding days — such as the Julian leap day missing from the proleptic Gregorian calendar, or the ten days dropped when the Julian became the Gregorian calendar — the number of days that the calendars differ by is undefined around those dates.
The table below assumes a Julian leap day of 29 February, but the Julian leap day (the bissextile day) was ante diem bis sextum Kalendas Martias in Latin or 24 February (see Julian reform), so dates between 24 and 29 February in all leap years were irregular.
Julian range | Proleptic Gregorian range | Gregorian ahead by: |
---|---|---|
From 3 March 1 BC (beginning of quadrennial leap years) to 28 February 100 |
From 1 March 1 BC to 26 February 100 |
−2 days |
From 2 March 100 to 28 February 200 |
From 1 March 100 to 27 February 200 |
−1 days |
From 1 March 200 to 28 February 300 |
From 1 March 200 to 28 February 300 |
0 days |
From 1 March 300 to 27 February 500 |
From 2 March 300 to 28 February 500 |
1 day |
From 1 March 500 to 26 February 600 |
From 3 March 500 to 28 February 600 |
2 days |
From 1 March 600 to 25 February 700 |
From 4 March 600 to 28 February 700 |
3 days |
From 1 March 700 to 24 February 900 |
From 5 March 700 to 28 February 900 |
4 days |
From 1 March 900 to 23 February 1000 |
From 6 March 900 to 28 February 1000 |
5 days |
From 1 March 1000 to 22 February 1100 |
From 7 March 1000 to 28 February 1100 |
6 days |
From 1 March 1100 to 21 February 1300 |
From 8 March 1100 to 28 February 1300 |
7 days |
From 1 March 1300 to 20 February 1400 |
From 9 March 1300 to 28 February 1400 |
8 days |
From 1 March 1400 to 19 February 1500 |
From 10 March 1400 to 28 February 1500 |
9 days |
From 1 March 1500 to 24 September 1582 |
From 11 March 1500 to 4 October 1582 |
10 days |
Read more about this topic: Proleptic Gregorian Calendar
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