Here are the four main market sessions and their opening/closing times.
LSE market - opens at 7 GMT and closes at 15:00 GMT
NYSE market opens at 13:30 GMT and closes at 20:00 GMT
Japanese stock market opens at 24:00 and closes at 06:00 GMT
Sydney stock exchange market opens at 24:00 and closes at 06:00 GMT
*You can also check the Extended Hours Trading for the Pre and After hours Markets by clicking here.