Ancient Roman Calendar. This ancient civilization laid the foundation for the calendar we use today, shaping how we perceive and measure time. The ancient calendar, development of the ancient calendar, the reforms made by the julian and then gregorian calendars, and the names of days of the week.

There were ten irregular months with a total of 304 days from. The early roman calendar originated as a local calendar in the city of rome, supposedly drawn up by romulus some seven or eight centuries before the christian era.