Not quite accurate. However, I will say that the story behind the Julian Calendar is hilarious. Before Julius Caesar, the Roman calendar was approved each year by the Roman Senate. Eventually Senators figured out that they could add a few days here to make their own term in office longer, or take a few away there to shorten their rival's term. They kept doing this, and pretty soon the calendar was so fucked up that it was snowing in June. So, Julius Caesar finally came along, told them to knock it off, made an extra long year to get everything back on track, developed a nice 365 day calendar, named a month after himself (July), and invented leap years.

Then his nephew Augustus came along and decided he wanted a month named after himself, too, and changed Sextilius to August, thereby robbing us of a month with the abbreviation "Sex."