UTC to JST converter
Japan Standard Time is 9 hours ahead of UTC year-round: UTC runs at UTC+0 and Japan Standard Time at UTC+9. To convert UTC to JST, add 9 hours to the UTC time. Neither zone observes daylight saving time, so the offsets hold on every date.
UTC runs at UTC+0, Japan Standard Time at UTC+9.
UTC to JST conversion table
Every hour of the day converted. One column is enough here: the gap between the two zones is the same in winter and summer.
| UTC (UTC) | Japan Standard Time (JST) |
|---|---|
| 00:00 12:00 AM | 09:00 9:00 AM |
| 01:00 1:00 AM | 10:00 10:00 AM |
| 02:00 2:00 AM | 11:00 11:00 AM |
| 03:00 3:00 AM | 12:00 12:00 PM |
| 04:00 4:00 AM | 13:00 1:00 PM |
| 05:00 5:00 AM | 14:00 2:00 PM |
| 06:00 6:00 AM | 15:00 3:00 PM |
| 07:00 7:00 AM | 16:00 4:00 PM |
| 08:00 8:00 AM | 17:00 5:00 PM |
| 09:00 9:00 AM | 18:00 6:00 PM |
| 10:00 10:00 AM | 19:00 7:00 PM |
| 11:00 11:00 AM | 20:00 8:00 PM |
| 12:00 12:00 PM | 21:00 9:00 PM |
| 13:00 1:00 PM | 22:00 10:00 PM |
| 14:00 2:00 PM | 23:00 11:00 PM |
| 15:00 3:00 PM | 00:00 12:00 AM next day |
| 16:00 4:00 PM | 01:00 1:00 AM next day |
| 17:00 5:00 PM | 02:00 2:00 AM next day |
| 18:00 6:00 PM | 03:00 3:00 AM next day |
| 19:00 7:00 PM | 04:00 4:00 AM next day |
| 20:00 8:00 PM | 05:00 5:00 AM next day |
| 21:00 9:00 PM | 06:00 6:00 AM next day |
| 22:00 10:00 PM | 07:00 7:00 AM next day |
| 23:00 11:00 PM | 08:00 8:00 AM next day |
How the UTC to JST conversion works
Converting UTC to JST means taking a wall-clock time in UTC (UTC, UTC+0) and expressing the same instant in Japan Standard Time (JST, UTC+9). The arithmetic is one step: add 9 hours to any UTC time, and it holds on every date of the year. Applying the gap pushes part of the day onto a different calendar date — the table below marks every row that shifts. In code, store the instant in UTC and convert with the IANA identifiers Etc/UTC and Asia/Tokyo, never with the abbreviations. One note on the source label: UTC is the fixed reference every other offset is measured against, and it never shifts. On the target label: JST has been fixed at UTC+9 since 1951 and shares its offset with Korea Standard Time. IANA identifiers carry the full offset history of a region, including every daylight saving transition ever legislated, which is why databases, schedulers, and APIs should store them.
Best time for meetings between UTC and JST
Working hours are taken as 09:00–18:00 in each zone. The window in force depends on the date, so both halves of the year are listed where they differ.
JST, year-round
The two working days meet at a single point: 9:00 AM UTC is 6:00 PM JST, exactly when the JST working day ends. A call of any real length needs one side to start early or finish late.
Daylight saving time: which side moves
Neither UTC nor Japan Standard Time observes daylight saving time, so the difference stays at 9 hours year-round. There is no transition weekend to plan around, and neither zone has a summer abbreviation.
- UTC
- Etc/UTC
- UTC — UTC+0
- Japan Standard Time
- Asia/Tokyo
- JST — UTC+9
Frequently asked questions
What is the time difference between UTC and JST?
Japan Standard Time runs 9 hours ahead of UTC on every date of the year. In offset terms, UTC sits at UTC+0 and Japan Standard Time at UTC+9. So 9:00 AM UTC is 6:00 PM JST. The hour-by-hour table on this page lists the conversion for all 24 hours so you do not have to do the arithmetic.
Does the UTC to JST difference change with daylight saving time?
The difference is fixed at 9 hours. Neither UTC nor Japan Standard Time observes daylight saving time, so no date in the calendar changes the conversion. Convert against the IANA rules for the exact date rather than a remembered offset. Both zones are handled here through their IANA identifiers, Etc/UTC and Asia/Tokyo, which encode the transitions.
What time is 9 am UTC in JST?
9:00 AM UTC is 6:00 PM in Japan Standard Time, and it stays that way all year because the two zones stay 9 hours apart. The rule is the same one the whole page runs on: add 9 hours to any UTC time. Check the hour-by-hour table for any other starting hour, including the rows that land on the previous or next calendar day.
What do UTC and JST stand for?
UTC stands for Coordinated Universal Time. JST stands for Japan Standard Time. Both are display labels rather than rules: the offsets behind them come from the IANA identifiers Etc/UTC and Asia/Tokyo. UTC is the fixed reference every other offset is measured against, and it never shifts. JST has been fixed at UTC+9 since 1951 and shares its offset with Korea Standard Time.
Related conversions
Need more than two zones at once? The full timezone converter shows a single moment across up to six IANA timezones, for any date you choose.