- 45 BC 1 Jan Julius Caesar's calendar reform - 365 days in 12 months with leap years every four years - is introduced.
- 1801 1 Jan The Act of Union between Great Britain and Ireland creates the United Kingdom.
- 1973 1 Jan Britain joins the European Economic Community at the third attempt, after rejections in 1963 and 1967.
World War One Centenary
- Find out more about how the BBC is covering the World War One Centenary, and see the latest programmes and online content
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