JST: Japan Standard Time
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JST to UTC: convert Japan Standard Time to Coordinated Universal Time
UTC is 9 hours behind JST all year.
Neither clock changes for daylight saving, so the gap never moves.
One instant, two local clocks
Drag one day across both zones
Shared instant12:00 UTC
Difference nowUTC is 9 hours behind
JSTJapan Standard Time
21:00Thu, Jan 15
UTCCoordinated Universal Time
12:00Thu, Jan 15
Approximate daylight 09:00 to 17:00 Selected local time
Both lanes show the same instant. Local dates, daylight, and offsets come from each IANA zone on the selected date, so daylight saving changes are included.
Right now
UTC: Coordinated Universal Time
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Local times come from your browser's IANA time zone data.
JST to UTC hour by hour
| JST | UTC |
|---|---|
| 12:00 AM | 3:00 PM (prev day) |
| 1:00 AM | 4:00 PM (prev day) |
| 2:00 AM | 5:00 PM (prev day) |
| 3:00 AM | 6:00 PM (prev day) |
| 4:00 AM | 7:00 PM (prev day) |
| 5:00 AM | 8:00 PM (prev day) |
| 6:00 AM | 9:00 PM (prev day) |
| 7:00 AM | 10:00 PM (prev day) |
| 8:00 AM | 11:00 PM (prev 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 |
Scheduling a call between JST and UTC
Standard business hours (9:00 AM to 5:00 PM) do not overlap: daytime in Japan Standard Time falls outside the working day in Coordinated Universal Time, so one side needs an early morning or late evening.
More JST conversions
Offsets are computed from the IANA time zone database for January 15 and July 15 of the current year. JST here means Japan Standard Time (Japan); UTC means Coordinated Universal Time (the world time standard).