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
3:06
Greenwich Mean Time
GMT
6:06
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How the JST to GMT time difference works
GMT is 9 hours behind JST. Japan Standard Time (JST) is the time zone of Japan. Greenwich Mean Time (GMT) is the fixed UTC+0 reference time, used by the United Kingdom and Ireland in winter. For example, 9:00 AM JST is 12:00 AM GMT. Scroll the timeline above to convert any moment, or use the chart below for a quick reference.
Time difference
9 hours
Daylight saving
Neither
JST offset
UTC+9
GMT offset
UTC+0
JST to GMT conversion chart
| Japan Standard Time (JST) | Greenwich Mean Time (GMT) |
|---|---|
| 12:00 AM | 3:00 PM -1 day |
| 1:00 AM | 4:00 PM -1 day |
| 2:00 AM | 5:00 PM -1 day |
| 3:00 AM | 6:00 PM -1 day |
| 4:00 AM | 7:00 PM -1 day |
| 5:00 AM | 8:00 PM -1 day |
| 6:00 AM | 9:00 PM -1 day |
| 7:00 AM | 10:00 PM -1 day |
| 8:00 AM | 11:00 PM -1 day |
| 9:00 AM | 12:00 AM |
| 10:00 AM | 1:00 AM |
| 11:00 AM | 2:00 AM |
| 12:00 PM | 3:00 AM |
| 1:00 PM | 4:00 AM |
| 2:00 PM | 5:00 AM |
| 3:00 PM | 6:00 AM |
| 4:00 PM | 7:00 AM |
| 5:00 PM | 8:00 AM |
| 6:00 PM | 9:00 AM |
| 7:00 PM | 10:00 AM |
| 8:00 PM | 11:00 AM |
| 9:00 PM | 12:00 PM |
| 10:00 PM | 1:00 PM |
| 11:00 PM | 2:00 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 9 hours behind JST. So 9:00 AM JST is 12:00 AM GMT, and 5:00 PM JST is 8:00 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 3:00 AM GMT in Greenwich Mean Time.
How many hours difference is there between JST and GMT?
There is a 9 hours difference. Greenwich Mean Time (GMT) runs 9 hours behind Japan Standard Time (JST).
Do JST and GMT observe daylight saving time?
Neither Japan Standard Time nor Greenwich Mean Time shifts its clocks for daylight saving time, so the 9 hours difference between them is the same all year. The United Kingdom and Ireland use GMT only in winter; from late March to late October they switch to British Summer Time (BST), one hour ahead of GMT.
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.