Byzantine time is the final Greek Anno Mundi method of keeping time that originated in the Byzantine Empire. [1]
It is now rarely used save for in Eastern Orthodox monasteries, for example, on Mount Athos in Greece [2] and Mar Saba monastery in the West Bank. Ethiopia (where Oriental Orthodoxy is the largest religion of the country) also uses this type of timing. [3]
In Byzantine time, hour 0:00:00 begins daily at sunset rather than midnight. [1] Due to seasonal variations in the length of a day, hour zero can vary by several hours throughout the year. The Byzantine calendar is a related method of keeping dates.