JST to UTC
-9hJST
JSTSOURCEUTC
UTCGreen rows indicate typical business hours (9 AM - 5 PM)
JST and UTC on the World Map
The map below highlights the JST (Japan Standard Time) and UTC (Coordinated Universal Time) timezone regions across the globe.
JST – Japan Standard Time
UTC+09:00Japan Standard Time (JST) is the time zone for Japan, 9 hours ahead of UTC.
- •Japan does not observe daylight saving time.
- •Tokyo is the most populous metropolitan area in the world.
- •The Tokyo Stock Exchange operates from 9:00 AM to 3:00 PM JST.
- •JST is 14 hours ahead of EST and 9 hours ahead of GMT.
UTC – Coordinated Universal Time
UTC+00:00Coordinated Universal Time (UTC) is the world's primary time standard, used as the basis for civil time worldwide.
- •UTC is the basis for all civil time zones worldwide.
- •The abbreviation 'UTC' is a compromise between English (CUT) and French (TUC).
- •UTC is based on atomic clocks and is accurate to within a nanosecond per day.
- •Servers and databases worldwide store timestamps in UTC to avoid timezone confusion.
- •Leap seconds are occasionally added to UTC to keep it aligned with Earth's rotation.
Comparing Time Zones: JST and UTC
JST runs on Japan Standard Time (JST) at UTC+09:00. UTC runs on Coordinated Universal Time (UTC) at UTC+00:00. That puts JST 9 hours behind UTC — a difference of -9h at the current offsets.
In practice, when it is 9:00 AM in JST it is 12:00 AM in UTC. Midnight in JST is 3:00 PM in UTC. Neither zone observes daylight saving time, so the offset between them stays constant all year.
JST to UTC time conversion table
| JST (JST) | UTC (UTC) | Day |
|---|---|---|
| 12:00 AM | 3:00 PM | previous day |
| 6:00 AM | 9:00 PM | previous day |
| 7:00 AM | 10:00 PM | previous day |
| 8:00 AM | 11:00 PM | previous day |
| 9:00 AM | 12:00 AM | same day |
| 12:00 PM | 3:00 AM | same day |
| 3:00 PM | 6:00 AM | same day |
| 5:00 PM | 8:00 AM | same day |
| 6:00 PM | 9:00 AM | same day |
| 9:00 PM | 12:00 PM | same day |
Why people convert JST to UTC time
- Scheduling a call from JST to UTC: a 10:00 AM start in JST lands at 1:00 AM in UTC, so you can confirm the slot without doing the arithmetic yourself.
- Handling a -9h gap: JST and UTC have no overlap inside a normal 9-to-5 day, so real-time meetings need an early-morning or late-evening slot on one side. 9:00 AM in UTC is 12:00 AM in JST.
- Watching a live event or market open: JST viewers need 12:00 AM in UTC to catch a 9:00 AM start there, and 9:00 AM if the event is anchored to JST.
- Always state the zone abbreviation, not just the hour. "3:00 PM JST" is unambiguous; "3 PM" across a -9h gap is not.
- With a -9h gap there is no shared 9-to-5 window, so alternate the early start: one week JST takes the early slot, the next week UTC does.
About JST (Japan Standard Time)
Japan Standard Time (JST) is the standard time zone for all of Japan. Japan does not observe daylight saving time. JST is 9 hours ahead of UTC and 14 hours ahead of EST. The Tokyo Stock Exchange, the world's third largest by market capitalization, operates on JST. South Korea uses the same offset (KST) but it is a distinct time zone.
About UTC (Coordinated Universal Time)
Coordinated Universal Time (UTC) is the primary time standard by which the world regulates clocks and time. It is effectively the successor to GMT and is based on International Atomic Time with leap seconds added to keep it synchronized with Earth's rotation. UTC is used in aviation, computing, navigation, weather forecasting, and the International Space Station. Most programming languages and databases store timestamps in UTC.
Best time to call between JST and UTC
With a -9h offset there is no overlap inside a normal 9 AM – 5 PM day. UTC opens at 9:00 AM UTC, which is 12:00 AM in JST, so real-time calls need an early-morning or late-evening slot on one side.
Business hours overlap
JST and UTC have no shared working hours because of the -9h gap. Teams need to alternate early starts or rely on asynchronous handovers.
JST is 9 hours behind UTC (JST UTC+09:00 → UTC UTC+00:00). There is no shared 9-to-5 window, so plan around an early or late slot. Remember to re-check around daylight-saving transitions.
Learn More About Time
Dive deeper into the fascinating world of timekeeping, time zones, and how they shape our global society:
Frequently Asked Questions
What is the time difference between JST and UTC?
JST (JST, UTC+09:00) is 9 hours behind UTC (UTC, UTC+00:00). The gap is currently -9h.
How do I convert JST time to UTC time?
Add -9h to JST local time. For example, 9:00 AM in JST is 12:00 AM in UTC.
What time is it in UTC right now?
UTC uses UTC at UTC+00:00. Use the live converter at the top of this page — it updates in real time and already accounts for the -9h offset from JST.
What is the best time to call UTC from JST?
There is no shared working-hours window because of the -9h gap. The closest option is 1:00 PM in JST, which is 4:00 AM in UTC.
Which is behind, JST or UTC?
JST is 9 hours behind UTC. When it is 12:00 PM in JST it is 3:00 AM in UTC.
Does daylight saving time affect the JST–UTC difference?
Neither zone observes daylight saving time, so the -9h offset between JST and UTC is fixed all year.
Which other cities share JST's time zone?
JST also covers Tokyo, Osaka, Yokohama, Nagoya, Sapporo, Kyoto, Kobe, Fukuoka and 1 more.
Which countries use JST, JST's zone?
JST is used in Japan.
Is there a day difference between JST and UTC?
Not normally. The -9h gap only pushes the date over the previous day.
What is the time difference between JST and UTC?
UTC is -9h from JST.
What timezone is JST in?
JST operates on its local timezone.
What timezone is UTC in?
UTC operates on its local timezone.
Which countries use JST (Japan Standard Time)?
JST is used in Japan.
Does JST observe daylight saving time?
No, JST does not observe daylight saving time and remains at UTC+09:00 year-round.
What are some interesting facts about JST?
Japan does not observe daylight saving time. Tokyo is the most populous metropolitan area in the world.
Which cities are in the UTC timezone?
Major cities in the UTC timezone include London, Dublin, Reykjavik, Accra, Lisbon, Dakar.
What is the UTC offset for UTC?
Coordinated Universal Time (UTC) is at UTC+00:00.
What should I know about the UTC timezone?
UTC is the basis for all civil time zones worldwide. The abbreviation 'UTC' is a compromise between English (CUT) and French (TUC).
When is it midnight in JST, what time is it in UTC?
When it is 12:00 AM (midnight) in JST (JST), it is -9h later in UTC (UTC).
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