20 17 April 16 What do you write in calligraphy?

Ding You's Late Spring/Late Spring XX Book

The calligraphy inscription format is divided into two sections, and the common one is a single section, that is, only the next section. The format of the next paragraph is:

Year (year by year)+month nickname+title+book.

(the month is based on the lunar calendar, usually not on a specific day)