Definition: The word "datetime" comes from Latin, meaning "to mark." It refers to a set of rules that defines when events occur within a calendar system. Detailed Definition: - The term "datetime" is used in religious contexts to describe specific dates or times related to certain holy days such as the day of Pentecost, the day of the Feast of Tabernacles, etc. (Revised Standard Bible) - In Christianity, it's often associated with Jesus' baptism by John the Baptist and His death on Calvary. - It's also used for various other religious or historical events that occur in a specific calendar year. In Greek and Jewish tradition, "datetime" is also used to refer to the sequence of the years in which Jesus lived.