Difference time between Hong Kong and Japan in hours, minutes, and seconds is [ -1 hours ] with gregorian date today is Wednesday 17th of September 2025 in Hongkongese local time, Where the time now in Hong Kong is 03:30 AM and the time now in Japan is 04:30 AM in Japanese local time and the time comparison between Hong Kong Special Administrative Region of China and Japan in greenwich time ( GMT ) where Hong Kong advanced about greenwich time ( GMT +08:00 ) while Japan advanced about greenwich time ( GMT +09:00 ).