Gui Maonian's calligraphy works were inscribed by Gui Maonian.
Calligraphy is divided into brush calligraphy and hard pen calligraphy. If it is brush calligraphy, it is generally signed in the traditional format.
In traditional calligraphy, dates are marked by years and months by the lunar calendar.
If it is hard-pen calligraphy, it can be written horizontally, which can be in modern format.