Hello how may I help you? I have a question about time zones Okay. I am more than happy to help. What is your question? How does time zones work? I can only calculate the times in different time zones. I can't provide information on how they work. what's the time zone in US and in CHINA You still there? Yes. There are multiple time zones in the US, but only one in China. Washington to be specific + Washington state or DC? DC Washington, D.C. is in the eastern time zone, and it is presently 10:49 p.m.