GMT to Japan
+9hGMT
GMTSOURCEJapan
JSTGreen rows indicate typical business hours (9 AM - 5 PM)
GMT and JST on the World Map
The map below highlights the GMT (Greenwich Mean Time) and JST (Japan Standard Time) timezone regions across the globe.
GMT – Greenwich Mean Time
UTC+00:00Greenwich Mean Time (GMT) is the mean solar time at the Royal Observatory in Greenwich, London. It is the same as UTC+00:00.
- •GMT is based on the Prime Meridian (0° longitude) passing through Greenwich, London.
- •The Royal Observatory in Greenwich has been the reference point for GMT since 1884.
- •GMT and UTC are often used interchangeably, but UTC is based on atomic clocks.
- •Iceland uses GMT year-round and never observes daylight saving time.
- •The UK switches from GMT to BST (British Summer Time) in late March each year.
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.
GMT vs Japan: Offsets, DST and Best Call Times
GMT runs on Greenwich Mean Time (GMT) at UTC+00:00. Japan runs on Japan Standard Time (JST) at UTC+09:00. That puts GMT 9 hours ahead of Japan — a difference of +9h at the current offsets.
In practice, when it is 9:00 AM in GMT it is 6:00 PM in Japan. Midnight in GMT is 9:00 AM in Japan. Neither zone observes daylight saving time, so the offset between them stays constant all year.
GMT to Japan time conversion table
| GMT (GMT) | Japan (JST) | Day |
|---|---|---|
| 12:00 AM | 9:00 AM | same day |
| 6:00 AM | 3:00 PM | same day |
| 7:00 AM | 4:00 PM | same day |
| 8:00 AM | 5:00 PM | same day |
| 9:00 AM | 6:00 PM | same day |
| 12:00 PM | 9:00 PM | same day |
| 3:00 PM | 12:00 AM | next day |
| 5:00 PM | 2:00 AM | next day |
| 6:00 PM | 3:00 AM | next day |
| 9:00 PM | 6:00 AM | next day |
Why people convert GMT to Japan time
- Scheduling a call from GMT to Japan: a 10:00 AM start in GMT lands at 7:00 PM in Japan, so you can confirm the slot without doing the arithmetic yourself.
- Handling a +9h gap: GMT and Japan 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 Japan is 6:00 PM in GMT.
- Coordinating a GMT-based team with Japan contacts: quoting times in the other side's local clock — not your own — removes the single biggest source of missed meetings.
- Always state the zone abbreviation, not just the hour. "3:00 PM GMT" 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 GMT takes the early slot, the next week Japan does.
About GMT (Greenwich Mean Time)
Greenwich Mean Time (GMT) is the clock time at the Royal Observatory in Greenwich, London, which sits on the Prime Meridian (0° longitude). GMT serves as the reference point from which all other time zones are calculated. The United Kingdom uses GMT during winter months and switches to British Summer Time (BST, UTC+01:00) from late March to late October. Several West African nations use GMT year-round. GMT is often used interchangeably with UTC (Coordinated Universal Time), although technically they are different – UTC is based on atomic clocks while GMT is based on Earth's rotation.
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.
Best time to call between GMT and Japan
With a +9h offset there is no overlap inside a normal 9 AM – 5 PM day. Japan opens at 9:00 AM JST, which is 6:00 PM in GMT, so real-time calls need an early-morning or late-evening slot on one side.
Business hours overlap
GMT and Japan have no shared working hours because of the +9h gap. Teams need to alternate early starts or rely on asynchronous handovers.
GMT is 9 hours ahead of Japan (GMT UTC+00:00 → JST UTC+09:00). There is no shared 9-to-5 window, so plan around an early or late slot. Remember to re-check around daylight-saving transitions.
🕐 Daylight Saving Time Info
GMT
☀ Currently in DST
Standard: UTC+00:00 · DST: UTC+01:00
Clocks fall back on Sun, Oct 25, 2026
Japan
Does not observe DST
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 GMT and Japan?
GMT (GMT, UTC+00:00) is 9 hours ahead of Japan (JST, UTC+09:00). The gap is currently +9h.
How do I convert GMT time to Japan time?
Add +9h to GMT local time. For example, 9:00 AM in GMT is 6:00 PM in Japan.
What time is it in Japan right now?
Japan uses JST at UTC+09:00. Use the live converter at the top of this page — it updates in real time and already accounts for the +9h offset from GMT.
What is the best time to call Japan from GMT?
There is no shared working-hours window because of the +9h gap. The closest option is 1:00 PM in GMT, which is 10:00 PM in Japan.
Which is ahead, GMT or Japan?
GMT is 9 hours ahead of Japan. When it is 12:00 PM in GMT it is 9:00 PM in Japan.
Do GMT and Japan use different time zones?
GMT uses GMT at UTC+00:00, while Japan (Japan) uses JST at UTC+09:00. The IANA identifiers are Europe/London and Asia/Tokyo.
Does daylight saving time affect the GMT–Japan difference?
Neither zone observes daylight saving time, so the +9h offset between GMT and Japan is fixed all year.
Which other cities share GMT's time zone?
GMT also covers London, Dublin, Lisbon, Accra, Reykjavik, Edinburgh, Casablanca, Dakar and 5 more.
Which countries use GMT, GMT's zone?
GMT is used in United Kingdom, Ireland, Iceland, Portugal (mainland), Ghana, Senegal, Mali, Mauritania and 7 more.
Is there a day difference between GMT and Japan?
Not normally. The +9h gap only pushes the date over for late-evening times.
What is the time difference between GMT and Japan?
Japan is +9h from GMT.
What timezone is GMT in?
GMT operates on its local timezone.
What timezone is Japan in?
Japan operates on its local timezone.
Which countries use GMT (Greenwich Mean Time)?
GMT is used in United Kingdom, Ireland, Iceland, Portugal (mainland), Ghana, Senegal, and 9 more countries.
Does GMT observe daylight saving time?
Yes, GMT switches to BST during summer months.
What are some interesting facts about GMT?
GMT is based on the Prime Meridian (0° longitude) passing through Greenwich, London. The Royal Observatory in Greenwich has been the reference point for GMT since 1884.
Which cities are in the JST timezone?
Major cities in the JST timezone include Tokyo, Osaka, Yokohama, Nagoya, Sapporo, Kyoto, Kobe, Fukuoka.
What is the UTC offset for JST?
Japan Standard Time (JST) is at UTC+09:00.
What should I know about the JST timezone?
Japan does not observe daylight saving time. Tokyo is the most populous metropolitan area in the world.
When is it midnight in GMT, what time is it in Japan?
When it is 12:00 AM (midnight) in GMT (GMT), it is +9h later in Japan (JST).
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