Well sir, since your time there have been numerous changes to the western calendar. If I'm not mistaken the last change occurred in 1582 when Pope Gregory XIII decreed a modification to the Julian calendar, a long time ago, certaily, but still way past the glory days of your Roman Republican Calendar.
As an ornament of the Roman pantheon, Romulus is timeless.
A quarter is a fourth.
12 / 4 = 3.