The year used in dates during the Roman Republic and the Roman Empire was the consular year, which began on the day when consuls first entered office — probably 1 May before 222 BC, 15 March from 222 BC to 154 BC, but this event was moved to 1 January in 153 BC.[16] In 45 BC, Julius Caesar introduced the Julian calendar, continuing to use 1 January as the first day of the new year.
In the Middle Ages in Europe a number of significant feast days in the ecclesiastical calendar of the Roman Catholic Church came to be used as the beginning of the Julian year:
** In Christmas Style dating the new year started on 25 December. This was used in Germany and England until the thirteenth century, and in Spain from the fourteenth to the sixteenth century. ** In Annunciation Style dating the new year started on 25 March, the feast of the Annunciation. This was used in many parts of Europe in the Middle Ages. Annunciation Style continued to be used officially in the Kingdom of Great Britain until 1 January 1752, except Scotland which changed to Circumcision Style dating on 1 January 1600, the Act being passed on 17 December 1599.[17] The rest of Great Britain changed to Circumcision Style on the 1 January preceding the conversion in Great Britain from the Julian calendar to the Gregorian calendar on 3/14 September 1752. The UK tax year still starts on 6 April which is 25 March + 12 days, eleven for the conversion from the Julian to the Gregorian calendar plus a dropped leap day in 1900. ** In Easter Style dating, the new year started on Easter Saturday (or sometimes on Good Friday). This was used in France from the eleventh to the sixteenth century. A disadvantage of this system was that because Easter was a movable feast the same date could occur twice in a year; the two occurrences were distinguished as "before Easter" and "after Easter". ** In Circumcision Style dating, the new year started on 1 January, the Feast of the Circumcision of Christ.
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