 In any case, the 8-day nundinal cycle began to be displaced by the 7-day week in the first century AD, and dominical letters began to appear alongside nundinal letters in the fasti.During the late Middle Ages days in the month came to be numbered in consecutive day order.Consequently, the leap day was considered to be the last day in February in leap years, i.e., 29 February, which is its current position.