How to add words to Tomb-Sweeping Day in 2020 A.D., and how to know it is the Year of the Rat at a glance?

It's simple. Just add "(Boxer Rebellion)" after "A.D. 2020" in the inscription on the stone tablet. Because the year of Gengzi is the "year of dry support" in the traditional calendar of China, the word "Zi" refers to the "mouse" in the zodiac. You see, at present, calligraphers' calligraphy inscription time is expressed in years.