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Conversion between Julian and Gregorian calendars
The tables below list equivalent dates in the Julian and Gregorian calendars. Years are given in astronomical year numbering.
==Conventions==
*Within these tables, January 1 is always the first day of the year.
*The Gregorian calendar did not exist before October 15, 1582. Gregorian dates before that are ''proleptic'', that is, using the Gregorian rules to reckon backward from October 15, 1582.
*Years are given in astronomical year numbering.
*Augustus corrected errors in the observance of leap years by omitting leap days until AD 8. Julian calendar dates before March AD 4 are proleptic, and do not necessarily match the dates actually observed in the Roman Empire. (Nautical almanac offices of the United Kingdom and United States, 1961, p. 411)
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