This is because the money market is a global market. Due to the development of communication technology, telephone and Internet, money holders can exchange money (or buy and sell money) at any time every day, regardless of the banking hours. So the foreign exchange market is traded 24 hours a day.

The United States opens at 9: 00 p.m. and Asia opens at 5: 00 or 6: 00 p.m., which means that the earliest bank in the American market (like the bank in London) is 9: 00 Beijing time, while the earliest bank in Asia (Tokyo) is 5: 00 Beijing time.