The Roman calendar

Months of the calendar in ancient Rome.
Note: Originally March was the start of the Roman year. This was changed to January when the republican calendar was introduced.
name length (days)
  700 - 50 BC 50 - 8 BC after 8 BC
(Republican calendar from c. 600 BC) Julian calendar
Martius 31 31 31
Aprilis 29 30 30
Maius 31 31 31
Iunonius 29 30 30
Quinctilis
(Julius)		 31 31 31
Sextilis
(Augustus)		 29 30 31
Septembris 29 31 30
Octobris 31 30 31
Novembris 29 31 30
Decembris 29 30 31
Ianuarius 29 31 31
Februarius 28
(23 or 24 in intercalating years)		 29
(30 every fourth year)		 28
(29 every fourth year)
Intercalans
(Mercedonius)		 27 or 28
(every second year only)		 - -

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