Can July be called Xia Yue in the Gregorian calendar? My friend's father wrote a calligraphy for his 70th birthday in July 1 1, asking for his autograph.

Yes Calligraphy and painting are written in the lunar calendar, and July in the solar calendar is June in the lunar calendar, which can be collectively called Xia Yue. You can also have the following nicknames:

Zhong Bai, Canxia, Cicada feathermoon, Changlie, Changxia, Quail Fire, Shu Yao, Yue Yun, Fuyue, Gengfu, Gong Yue, Lianyue, Jixia, Jiyang, Late Summer, Jixiayue, Jianwei, Jiaoshu, Yue Yue and Jingyang.