When should calligraphy works be written?

Calligraphy is divided into brush calligraphy and hard pen calligraphy.

If it is brush calligraphy, the traditional format is generally used. Signature can have a deposit. Common only the next paragraph, the format is:

Time (usually not Gregorian calendar)+(%location)+author+(respect) book. Such as: "Xin Chou Xia Yue worships books in Gufengtang XX".

In traditional calligraphy, dates are marked by years, and months are marked by lunar calendar, not specific to a certain day. If it is hard-pen calligraphy and horizontal writing, it can be written in modern format: 202 1 year x month x day XXX book. If it is vertical, it should also be in the traditional format.