When Did The Calendar Begin. It continued until december, which was harvest time in temperate rome. When julius caesar introduced his calendar in 45 b.c.e., he made 1 january the start of the year, and it was always the date on which the solar number and the golden number were incremented.
In september 1752 the julian calendar was replaced with the gregorian calendar in great britain and its american colonies. The earliest calendars date back to the bronze age with civilisations in the near east region, such as the babylonians and persians, being among the first to record time by using natural cycles.