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
AUC532 (222
BC), 15 March from
AUC532 (222
BC) and 1 January from
AUC601 (153
BC).
[34] The Julian calendar, which began in
AUC709 (45
BC), continued to use 1 January as the first day of the
new year. Even though the year used for dates changed, the civil year always displayed its months in the order January to December from the Roman Republican period until the present.
During the Middle Ages, under the influence of the Catholic Church, many Western European countries moved the start of the year to one of several important Christian festivals—25 December (supposed
Nativity of Jesus), 25 March (
Annunciation), or Easter (France),
[35] while the Byzantine Empire began its year on 1 September and Russia did so on 1 March until 1492 when the new year was moved to 1 September.
[36]
In common usage, 1 January was regarded as New Year's Day and celebrated as such,
[37] but from the 12th century until 1751 the legal year in England began on 25 March (
Lady Day).
[38] So, for example, the Parliamentary record lists the execution of
Charles I on 30 January as occurring in 1648 (as the year did not end until 24 March),
[39] although later histories adjust the start of the year to 1 January and record the execution as occurring in 1649.
[40]
Most Western European countries changed the start of the year to 1 January before they adopted the Gregorian calendar. For example, Scotland changed the start of the Scottish New Year to 1 January in 1600 (this means that 1599 was a short year). England, Ireland and the British colonies changed the start of the year to 1 January in 1752 (so 1751 was a short year with only 282 days). Later in 1752 in September the Gregorian calendar was introduced throughout Britain and the British colonies (see the section
Adoption). These two reforms were implemented by the
Calendar (New Style) Act 1750.
[41]
In some countries, an official decree or law specified that the start of the year should be 1 January. For such countries, a specific year when a 1 January-year became the norm can be identified. In other countries, the customs varied, and the start of the year moved back and forth as fashion and influence from other countries dictated various customs.