Monday. The American calendar is the same as the Chinese one, but the specific time is slightly different. September 19, 2022 is Monday in the United States and Tuesday in China. The United States is 16 hours behind China. For example, it is 18:00 pm now, and it is two o'clock in the morning in the United States at the same time. Because the time zone is different, there is a time difference, and within a certain time period, they are not on the same day.