In said calendar, the months are exactly the same as in the Gregorian Calendar, except the month of December is first and November is last; That means that the New Romanian year lasts between December 1 and November 30.
Also, the New Romanian Calendar has the Great Union Day as its epoch (December 1 1918), since the years are measured around it. Therefore, there are the years Before the Great Union (BGU) and the years After the Great Union (AGU).
Also the period between December 1 1918 and November 30 1919 (Gregorian dates) is known as Year 0. Everything before it consists of the BGU years, while everything after it consists of the AGU years.