I have this from the Augustus character un the history files...
The birth date for Augustus (character 145290) is 3.1.1, which of course doesn't tell us much, since it is just the smallest possible year, as he was born in a BC year.
The only other date in Augustus' entry is that for his death, and he died in an AD year. Historically, he died on 14.8.19 (using the yyyy.mm.dd format), while in the game he is set to die in 24.8.19 - the reason why is explained in a comment in the entry ("death date moved 10 years later in order not to be portrayed as a child"). So nothing in Augustus' entry corroborates what you said.