JST to GMT Time Converter
Convert Japan Standard Time to Greenwich Mean Time instantly.
Scroll the timeline to check any hour of the day.
Japan Standard Time
JST
5:24
Greenwich Mean Time
GMT
9:24
JST is on standard time (JST), while GMT is on daylight savings (BST) right now.
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How the JST to GMT time difference works
GMT is 8 hours behind JST. Japan Standard Time (JST) is the time zone of Japan. Greenwich Mean Time (GMT) is the time zone of the United Kingdom and Ireland. For example, 9:00 AM JST is 1:00 AM GMT. Scroll the timeline above to convert any moment, or use the chart below for a quick reference.
Time difference
8 hours
Daylight saving
GMT only
JST offset
UTC+9
GMT offset
UTC+0
JST to GMT conversion chart
| Japan Standard Time (JST) | Greenwich Mean Time (GMT) |
|---|---|
| 12:00 AM | 4:00 PM -1 day |
| 1:00 AM | 5:00 PM -1 day |
| 2:00 AM | 6:00 PM -1 day |
| 3:00 AM | 7:00 PM -1 day |
| 4:00 AM | 8:00 PM -1 day |
| 5:00 AM | 9:00 PM -1 day |
| 6:00 AM | 10:00 PM -1 day |
| 7:00 AM | 11:00 PM -1 day |
| 8:00 AM | 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 |
Cities in each time zone
Japan Standard Time (JST)
TokyoOsakaYokohamaNagoyaSapporo
Greenwich Mean Time (GMT)
LondonDublinLisbonEdinburghManchester
JST to GMT questions
Is GMT ahead of or behind JST?
GMT is 8 hours behind JST. So 9:00 AM JST is 1:00 AM GMT, and 5:00 PM JST is 9:00 AM GMT.
What time is it in GMT when it is 12:00 PM JST?
When it is 12:00 PM (noon) JST in Japan Standard Time, it is 4:00 AM GMT in Greenwich Mean Time.
How many hours difference is there between JST and GMT?
There is a 8 hours difference. Greenwich Mean Time (GMT) runs 8 hours behind Japan Standard Time (JST).
Do JST and GMT observe daylight saving time?
Greenwich Mean Time observes daylight saving time but Japan Standard Time does not, so the difference between them changes by an hour twice a year.
What is the best time to schedule a meeting between JST and GMT?
A standard 9-to-5 workday in Japan Standard Time and Greenwich Mean Time does not overlap, so pick the early morning in the later zone or the late evening in the earlier zone.
Which cities use JST and GMT?
Japan Standard Time (JST) covers cities such as Tokyo, Osaka, Yokohama, Nagoya, Sapporo. Greenwich Mean Time (GMT) covers cities such as London, Dublin, Lisbon, Edinburgh, Manchester.