JST to WAT
-8hJST
JSTSOURCEWAT
WATGreen rows indicate typical business hours (9 AM - 5 PM)
JST and WAT on the World Map
The map below highlights the JST (Japan Standard Time) and WAT (West Africa 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.
WAT – West Africa Time
UTC+01:00West Africa Time (WAT) is the time zone for West and Central Africa, 1 hour ahead of UTC.
- •Lagos, Nigeria is the most populous city in Africa.
- •WAT is the same offset as CET (UTC+01:00).
- •Nigeria does not observe daylight saving time.
Comparing Time Zones: JST and WAT
JST runs on Japan Standard Time (JST) at UTC+09:00. WAT runs on West Africa Time (WAT) at UTC+01:00. That puts JST 8 hours behind WAT — a difference of -8h at the current offsets.
In practice, when it is 9:00 AM in JST it is 1:00 AM in WAT. Midnight in JST is 4:00 PM in WAT. Neither zone observes daylight saving time, so the offset between them stays constant all year.
JST to WAT time conversion table
| JST (JST) | WAT (WAT) | Day |
|---|---|---|
| 12:00 AM | 4:00 PM | previous day |
| 6:00 AM | 10:00 PM | previous day |
| 7:00 AM | 11:00 PM | previous day |
| 8:00 AM | 12:00 AM | same day |
| 9:00 AM | 1:00 AM | same day |
| 12:00 PM | 4:00 AM | same day |
| 3:00 PM | 7:00 AM | same day |
| 5:00 PM | 9:00 AM | same day |
| 6:00 PM | 10:00 AM | same day |
| 9:00 PM | 1:00 PM | same day |
Why people convert JST to WAT time
- Scheduling a call from JST to WAT: a 10:00 AM start in JST lands at 2:00 AM in WAT, so you can confirm the slot without doing the arithmetic yourself.
- Handling a -8h gap: JST and WAT 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 WAT is 1:00 AM in JST.
- Keeping family and friends in sync: knowing that 8:00 PM in JST is 12:00 PM in WAT makes it easy to avoid calling at 3 AM.
- Always state the zone abbreviation, not just the hour. "3:00 PM JST" is unambiguous; "3 PM" across a -8h gap is not.
- With a -8h gap there is no shared 9-to-5 window, so alternate the early start: one week JST takes the early slot, the next week WAT 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 WAT (West Africa Time)
West Africa Time (WAT) is used across much of West and Central Africa, including Nigeria, the most populous country in Africa. WAT does not observe daylight saving time and shares the same offset as Central European Time (CET).
Best time to call between JST and WAT
With a -8h offset there is no overlap inside a normal 9 AM – 5 PM day. WAT opens at 9:00 AM WAT, which is 1:00 AM in JST, so real-time calls need an early-morning or late-evening slot on one side.
Business hours overlap
JST and WAT have no shared working hours because of the -8h gap. Teams need to alternate early starts or rely on asynchronous handovers.
JST is 8 hours behind WAT (JST UTC+09:00 → WAT UTC+01:00). 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 WAT?
JST (JST, UTC+09:00) is 8 hours behind WAT (WAT, UTC+01:00). The gap is currently -8h.
How do I convert JST time to WAT time?
Add -8h to JST local time. For example, 9:00 AM in JST is 1:00 AM in WAT.
What time is it in WAT right now?
WAT uses WAT at UTC+01:00. Use the live converter at the top of this page — it updates in real time and already accounts for the -8h offset from JST.
What is the best time to call WAT from JST?
There is no shared working-hours window because of the -8h gap. The closest option is 1:00 PM in JST, which is 5:00 AM in WAT.
Which is behind, JST or WAT?
JST is 8 hours behind WAT. When it is 12:00 PM in JST it is 4:00 AM in WAT.
Does daylight saving time affect the JST–WAT difference?
Neither zone observes daylight saving time, so the -8h offset between JST and WAT 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 WAT?
Not normally. The -8h gap only pushes the date over the previous day.
What is the time difference between JST and WAT?
WAT is -8h from JST.
What timezone is JST in?
JST operates on its local timezone.
What timezone is WAT in?
WAT 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 WAT timezone?
Major cities in the WAT timezone include Lagos, Abuja, Douala, Yaoundé, Luanda, Kinshasa, Brazzaville.
What is the UTC offset for WAT?
West Africa Time (WAT) is at UTC+01:00.
What should I know about the WAT timezone?
Lagos, Nigeria is the most populous city in Africa. WAT is the same offset as CET (UTC+01:00).
When is it midnight in JST, what time is it in WAT?
When it is 12:00 AM (midnight) in JST (JST), it is -8h later in WAT (WAT).
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See every conversion from JST →·See every conversion from WAT →