All of Japan is in the same time zone, from Hokkaido down to Okinawa in the south. Japan is in a time zone referred to as “Japan Standard Time”(JST), which is 9 hours ahead of Greenwich Time. It is 17 hours ahead of Los Angeles, 14 hours ahead of New York, and 9 hours ahead of London. (During the summer, the difference is one hour less). There is a one-hour time difference with Beijing, but Korea is in the same time zone.