Calligraphy inscriptions can have upper and lower paragraphs. Only the next paragraph is common. The format of the next paragraph is,
Time (usually not Gregorian calendar)+(location)+author+(respect) book
Such as: "B is not in the spring (the next Huan) in the ancient style hall XX to honor the book."
In traditional calligraphy, dates are marked by years, and months are marked by lunar calendar, not specific to a certain day.