Today's calligraphy is out of date.

Generally, calligraphy inscriptions are written by the author plus the lunar year and month. If the date is not written, the month will be given another name. For example, Wang Xizhi wrote the twelfth lunar month in B, or: Wang Xizhi wrote the twelfth lunar month in B.

Attached is another name of the lunar month for reference.

January: the first month, the second month, the month of Meng, the end of the month, beginning of spring and beginning of spring;

February: such as the moon, apricot moon, mid-spring and early spring;

March: Sick Month, Peach Month, Ji Chun, Bingyue, Sanchun, Yangchun and Late Spring;

April: Yuyue, Qinghe, Taoyue and Xia Meng;

May: durian month, thin month and midsummer;

June: and month, lotus month, Xia Yue, late summer month;

July: Meet, Qiao Yue, Shuangyue, Qiu Meng and the same month;

August: Zhuangyue, Gui Yue, Mid-Autumn Festival, Mid-Autumn Festival;

September: autumn, auspicious sea and moon, gathering the moon;

October: Yangyue, Xiaoyangchun and Germination;

November: Gu Yue, Jiayue and Midwinter;

December: Tuyue, Twelfth Moon, Jiapingyue and Jidong.