What day is September 4th?

According to the perpetual calendar, September 4th, 2023 is Monday. The perpetual calendar is the oldest solar calendar in ancient legends of China. The name of the perpetual calendar comes from a man named Wannian in Shang Dynasty. Wannian is the editor of this calendar. In order to commemorate its achievements, this calendar was named "perpetual calendar". The perpetual calendar in use now is an annual calendar that includes or applies to several years. With the development of science and technology, modern perpetual calendars can display multiple sets of calendars such as solar calendar, lunar calendar and trunk calendar at the same time, and can also contain various functional information such as good or bad luck, holidays and reminders.