Hard-pen calligraphy signatures can be written in modern or traditional formats.
Generally, for works that are arranged horizontally, punctuation marks are allowed, and the signature format can be written as: Book XXX, June 2020.
If it is arranged vertically, punctuation marks are usually not added. The signature should be in the traditional format, that is:
Wuxu Xia Yue/Luxia Xia XX book.
In the traditional format, months are given names and calculated according to the lunar calendar. The name is often given without a surname.