Years old in the Jiawu Meng (Middle Summer) xx book.
There is a saying that it is late spring and March, mostly midsummer, but it is rarely late summer.
It can also be written as:
Sweating at xx in the midsummer of Jiawu. A letter in XX (place or place, such as the sea) in the middle of summer. Jiawu Xiayue was written in Chongqing XX.