Proleptic Gregorian Calendar - Difference Between Julian and Proleptic Gregorian Calendar Dates

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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