GMT to JST Converter – Greenwich Mean Time to Japan Standard Time
JST is 9 hours ahead of GMT. GMT (Greenwich Mean Time) is UTC+0, switching to BST (UTC+1) during daylight saving, while JST (Japan Standard Time) is UTC+9 all year. The live clocks below show the current time in both zones, updated every second.
GMT to JST Conversion Table (Hour by Hour)
Standard-time conversion from Greenwich Mean Time to Japan Standard Time. During daylight saving periods the offset shifts by one hour - the live clocks above always show the correct current time.
| GMT (UTC+0) | JST (UTC+9) |
|---|---|
| 12:00 AM | 9:00 AM |
| 1:00 AM | 10:00 AM |
| 2:00 AM | 11:00 AM |
| 3:00 AM | 12:00 PM |
| 4:00 AM | 1:00 PM |
| 5:00 AM | 2:00 PM |
| 6:00 AM | 3:00 PM |
| 7:00 AM | 4:00 PM |
| 8:00 AM | 5:00 PM |
| 9:00 AM | 6:00 PM |
| 10:00 AM | 7:00 PM |
| 11:00 AM | 8:00 PM |
| 12:00 PM | 9:00 PM |
| 1:00 PM | 10:00 PM |
| 2:00 PM | 11:00 PM |
| 3:00 PM | 12:00 AM (next day) |
| 4:00 PM | 1:00 AM (next day) |
| 5:00 PM | 2:00 AM (next day) |
| 6:00 PM | 3:00 AM (next day) |
| 7:00 PM | 4:00 AM (next day) |
| 8:00 PM | 5:00 AM (next day) |
| 9:00 PM | 6:00 AM (next day) |
| 10:00 PM | 7:00 AM (next day) |
| 11:00 PM | 8:00 AM (next day) |
Frequently Asked Questions
What is the time difference between GMT and JST?
JST is 9 hours ahead of GMT. GMT (Greenwich Mean Time) is UTC+0 and JST (Japan Standard Time) is UTC+9.
How do I convert GMT to JST?
Take your time in GMT and add 9 hours. For example, 9:00 AM GMT is 6:00 PM in JST. The live clocks at the top of this page always show the current conversion.
Does daylight saving time affect GMT to JST conversion?
Yes. GMT switches to BST (UTC+1) in summer, so the gap between the two zones changes during DST periods. The live clocks on this page use the IANA timezone database and always reflect the correct current offset automatically.
What is the best time for a meeting between GMT and JST?
Look for overlap between 9:00 AM-6:00 PM working hours in both zones using the conversion table above. JST is 9 hours ahead of GMT, so overlap is limited - early morning in one zone and evening in the other usually works best.