Brush calligraphy generally adopts traditional format. Signature can have a deposit. Only the next paragraph is commonly used, and the format is: time (generally not Gregorian calendar)+(%place)+author+(respect) book. Such as: "Gui Maochun worships the ancient style hall XX Chinese book". In traditional calligraphy, dates are marked by years, and months are marked by lunar calendar, not specific to a certain day.
The date of signature is in the lunar calendar (lunar calendar), but they are all in the lunar calendar; If you use the solar calendar, you will use all the solar calendars. However, traditional content should not use the solar calendar. Write from the left and sign on the right; Write from the right and sign on the left.