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Before Julius Caesar reformed the Roman Calendar in 46 BCE, regular years had 12 months totaling 355 days (12 lunar cycles), and leap years, or intercalary years, had 13 months totaling 377 and 378 days alternately.

Caesar changed the number of days per month as follows:

  • Ianuarius: 29 days --> 31 days
  • Februarius of regular years: 28 days (no change)
  • Februarius of leap years: alternated between 23 & 24 days --> 29 days
  • Intercalaris (leap years only): 27 days --> abolished
  • Martius: 31 days (no change)
  • Aprilis: 29 days --> 30 days
  • Maius: 31 days (no change)
  • Iunius: 29 days --> 30 days
  • Quintilis: 31 days (no change)
  • Sextilis: 29 days --> 31 days
  • September: 29 days --> 30 days
  • October: 31 days (no change)
  • November: 29 days --> 30 days
  • December: 29 days --> 31 days
  • regular year total: 355 days --> 365 days
  • leap year total: alternately 377 & 378 days --> 366 days

In 44 BCE, Quintilis was renamed Iulius in honor of Julius Caesar, and in 8 BCE, Sextilis was renamed Augustus in honor of Augustus Caesar.

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11y ago

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