Anno Lucis

Examples of use
Detail from the 1916 cornerstone of a Masonic lodge in Rochester, Minnesota
October 2003 plaque on the wall of the city hall in South Sioux City, Nebraska

Anno Lucis (“in the Year of Light”) is a dating system used in Masonic ceremonial or commemorative proceedings, which is equivalent to the Gregorian year plus 4000. It is similar to Anno Mundi.