Martius (March), Aprilis (April), Maius (May), Iunius (June), Quinctilis/Iulius (July), Sextilis/Augustus (August), September, October, November, December, Januarius (January), and Februarius (February).
Each month has three special days: the kalends was the 1st of the month; the nones is the 5th of the month, except in March, May, July, and October when it is the 7th; the ides is the 13th of the month, except in March, May, July, and October when it is the 15th. Dates are numbered by the number of days to the next special day. For example, March 31st is the day before the kalends of April, and is called pridies kalends Aprilis; March 30th is the second day before the kalends of April, and is called ante dies (“the day before”) II kalends Aprilis.
Roman days began and ended at dawn. Each day always consisted of exactly 12 daytime hours and 12 nighttime hours, which means that the length of an hour had to vary with the seasons, ranging from about 44 minutes (daytime at winter solstice and nighttime at summer solstice) to 1 hour 16 minutes (daytime at summer solstice and nighttime at winter solstice).