See the live UTC time next to the current time in Japan, check today's real offset, and roll through any UTC time to find the matching JST time — including when the two zones fall on different dates.
Japan Standard Time
Coordinated Universal Time
United Kingdom Time
THE CLOCKS ABOVE ALWAYS SHOW THE LIVE CURRENT TIME. THE ROLLER BELOW IS A LOOKUP TOOL — ROTATING IT NEVER CHANGES THEM.
JST is 9 hours ahead of UTC
GMT/BST is 1 hour ahead of UTC
Japan is 8 hours ahead of United Kingdom
| UTC | JST | Date |
|---|---|---|
| 00:00 | 09:00 | Same day |
| 01:00 | 10:00 | Same day |
| 02:00 | 11:00 | Same day |
| 03:00 | 12:00 | Same day |
| 04:00 | 13:00 | Same day |
| 05:00 | 14:00 | Same day |
| 06:00 | 15:00 | Same day |
| 07:00 | 16:00 | Same day |
| 08:00 | 17:00 | Same day |
| 09:00 | 18:00 | Same day |
| 10:00 | 19:00 | Same day |
| 11:00 | 20:00 | Same day |
| 12:00 | 21:00 | Same day |
| 13:00 | 22:00 | Same day |
| 14:00 | 23:00 | Same day |
| 15:00 | 00:00 | Next day in Japan |
| 16:00 | 01:00 | Next day in Japan |
| 17:00 | 02:00 | Next day in Japan |
| 18:00 | 03:00 | Next day in Japan |
| 19:00 | 04:00 | Next day in Japan |
| 20:00 | 05:00 | Next day in Japan |
| 21:00 | 06:00 | Next day in Japan |
| 22:00 | 07:00 | Next day in Japan |
| 23:00 | 08:00 | Next day in Japan |
Coordinated Universal Time (UTC) is the world's time standard: it never shifts for seasons and every other zone is described as an offset from it. Japan Standard Time (JST) is the clock used in Japan. Converting UTC to JST means adding that offset to the UTC reading.
Japan Standard Time applies to the entire country, including Okinawa, and is aligned to the 135° E meridian near Akashi.
Take the UTC time, apply the current JST offset shown in the live panel above, and roll the date forward or back if the result crosses midnight. The interactive roller does all three steps for you: the left drum is UTC, the right drum is JST, and a day badge appears whenever the local date differs.
JST has no daylight saving changes, so the offset to UTC is stable all year. It is still calculated live from the Asia/Tokyo IANA database rather than hard-coded.
The reference table below the tool lists every UTC half hour against the matching JST time for today, so you can copy a conversion without touching the roller.
Japan has not observed daylight saving time since the late 1940s, so JST is a constant UTC +09:00.