Sextilis said to be the same as August
The Romans did not number days of a month sequentially from the 1st through the last day. Instead, they counted back from the three fixed points of the month: the Nones (5th or 7th, depending on the length of the month), the Ides (13th or 15th), and the Kalends (1st) of the following month. The Nones of August was the 5th, and the Ides the 13th. The last day of August was the pridie Kalendas Septembris, "day before the Kalends of September". Roman counting was inclusive; 9 August was ante diem V Idūs Sextīlis (ante diem V Idūs Augustas), "the 5th day before the Ides of August," usually abbreviated a.d. V Id. Sext. (a.d. V Id. Aug.), or with the a.d. omitted altogether. The Julian calendar reform added two days to Sextilis; thus on the pre-reform calendar, 23 August was VIII Kal. Sept., "the 8th day before the Kalends of September," but on the Julian calendar X Kal. Sept., "the 10th day before the Kalends of September".
On the calendar of the Roman Republic and early Principate, each day was marked with a letter to denote its religiously lawful status. In August, these were:
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