What is the date of signature of calligraphy works, April or May?

April-Mitsuki, Huaiyue, Yuyue, Qinghe and Xia Meng.

May-noon, durian, Puyue, Duanyue and midsummer.

In ancient letters, calligraphy and paintings, inscriptions were often used. When giving gifts, the names and dates were written vertically with a brush to show the giver and the recipient. This is also a manifestation of calligraphy art. Now many people sign official documents and notes, usually horizontally, to show their legal effect.