Those dates look odd. 5899 , 5906.
Most younger masons might look at that in wonder. However, research at the Masonic Lodge of Education tells us that:
Anno Lucis is Latin for “Year of Light.” You will also see it abbreviated as “A.L.” It is used as a calendar system within the Freemason fraternity.
Year of Light refers to the biblical account of the creation of the universe wherein God spoke and said: “Let there be light,…and there was light.” (Genesis 1:3)
Albert Mackey, Freemason historian, in his Revised Encyclopedia of Freemasonry published in 1920 describes Anno Lucis as follows:
Anno Lucis: “The date used in ancient Craft Masonry; found by adding 4000 to the Vulgar Era; thus, 1911 + 4000 = 5911.
End of Albert Mackey
The “Vulgar” era which Dr. Mackey describes is what we now call our current year. Vulgar is defined as lacking quality, taste or refinement.
Some people with anti-Masonic sentiment (and no knowledge of Latin) fear that Anno Lucis means “in the Year of Lucifer”, (a reference to Satan), however nothing could be farther from the truth.
Freemasonry is a very old fraternity. It has many archaic words, like Anno Lucis, within its rituals.
The term, Anno Lucis, is used by Freemasons to denote the Year of Light, which is the year in which God created the world, approximately 4,000 years before the beginning of the Common Era.
Therefore, (2013 + 4000) would be the year 6013 A.L. (Anno Lucis)