Does it account for Daylight Saving Time?

Yes, our converter uses the IANA timezone database, which includes all current DST rules for every timezone in the world.

UTC (Coordinated Universal Time) is the primary time standard by which the world regulates clocks. All timezones are defined as offsets from UTC.

Can I compare multiple timezones at once?

Yes, you can add multiple cities or timezones and see the equivalent times side by side.

How many timezones are there in the world?

There are 38 distinct UTC offsets in use, ranging from UTC-12 to UTC+14. This includes half-hour (UTC+5:30 India, UTC+9:30 Australia) and 45-minute offsets (UTC+5:45 Nepal, UTC+8:45 Australia).

What is the International Date Line?

The International Date Line (IDL) runs roughly along the 180° meridian in the Pacific Ocean. When you cross it westward, you gain a day; crossing eastward, you lose a day.

Why do some timezones have 30 or 45 minute offsets?

Countries chose offsets that best matched their solar noon. India uses UTC+5:30 and Nepal uses UTC+5:45 because standard hourly offsets didn't align well with their geography.

Which country has the most timezones?

France has the most (12 timezones) due to overseas territories. Russia spans 11 timezones. The US has 6 (including Hawaii and Alaska).

GMT to Tokyo

+9h

GMT

GMTSOURCE

UTC+01:00☀ DST active

HH12

MM00

12:00 (24-hr)

12 AM6 AM12 PM6 PM12 AM

Tokyo

JST

Japan · UTC+09:00

HH09

MM00

21:00 (24-hr)

12 AM6 AM12 PM6 PM12 AM

Quick Reference

Time Conversion Table

GMT

Tokyo

12:00 AM

8:00 AM

2:00 AM

10:00 AM

4:00 AM

12:00 PM

6:00 AM

2:00 PM

8:00 AM

4:00 PM

10:00 AM

6:00 PM

12:00 PM

8:00 PM

2:00 PM

10:00 PM

4:00 PM

12:00 AM+1

6:00 PM

2:00 AM+1

8:00 PM

4:00 AM+1

10:00 PM

6:00 AM+1

Green 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 Zone

→

JST Zone

Explore all world timezones interactively →

GMT – Greenwich Mean Time

UTC+00:00

Greenwich Mean Time (GMT) is the mean solar time at the Royal Observatory in Greenwich, London. It is the same as UTC+00:00.

Countries in GMT

United KingdomIrelandIcelandPortugal (mainland)GhanaSenegalMaliMauritaniaGambiaGuineaSierra LeoneLiberiaIvory CoastBurkina FasoMorocco (historically)

Major Cities in GMT

LondonDublinLisbonAccraReykjavikEdinburghCasablancaDakarBamakoAbidjanConakryFreetownMonrovia

Key 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.
•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.

Daylight Saving:Yes – switches to BST

Learn more about GMT on Wikipedia

JST – Japan Standard Time

UTC+09:00

Japan Standard Time (JST) is the time zone for Japan, 9 hours ahead of UTC.

Countries in JST

Japan

Major Cities in JST

TokyoOsakaYokohamaNagoyaSapporoKyotoKobeFukuokaHiroshima

Key Facts about JST

•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.

Daylight Saving:No – UTC+09:00 year-round

Learn more about JST on Wikipedia

About Tokyo

Wikipedia

Tokyo operates on Japan Standard Time (JST), which is 14 hours ahead of New York. As Asia's largest financial hub, Tokyo trading hours are crucial for global markets.

Population:14 million

Metro:37.4 million

Business Hours:9:00 AM - 6:00 PM JST

Currency:JPY (¥)

Stock Exchange:TSE (Tokyo Stock Exchange)

Key Landmarks

Tokyo TowerShibuya CrossingSenso-ji TempleImperial PalaceTokyo Skytree

Did You Know?

The Tokyo subway system moves approximately 8.7 million passengers daily.

Learn more about JST timezone →

GMT vs Tokyo: Offsets, DST and Best Call Times

GMT runs on Greenwich Mean Time (GMT) at UTC+00:00. Tokyo runs on Japan Standard Time (JST) at UTC+09:00. That puts GMT 9 hours ahead of Tokyo — a difference of +9h at the current offsets.

In practice, when it is 9:00 AM in GMT it is 6:00 PM in Tokyo. Midnight in GMT is 9:00 AM in Tokyo. Neither zone observes daylight saving time, so the offset between them stays constant all year.

GMT to Tokyo time conversion table

GMT (GMT)	Tokyo (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 Tokyo time

Scheduling a call from GMT to Tokyo: a 10:00 AM start in GMT lands at 7:00 PM in Tokyo, so you can confirm the slot without doing the arithmetic yourself.
Handling a +9h gap: GMT and Tokyo 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 Tokyo is 6:00 PM in GMT.
Watching a live event or market open: GMT viewers need 6:00 PM in Tokyo to catch a 9:00 AM start there, and 3:00 PM if the event is anchored to GMT.

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 Tokyo 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 Tokyo

With a +9h offset there is no overlap inside a normal 9 AM – 5 PM day. Tokyo 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 Tokyo 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 Tokyo (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

Tokyo

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:

⏳

History of Timekeeping

From sundials to atomic clocks - 5000 years of measuring time

🌍

How Time Zones Work

UTC, offsets, and why zones don't follow straight lines

☀️

Daylight Saving Time

DST dates, which countries observe it, and the ongoing debate

Frequently Asked Questions

What is the time difference between GMT and Tokyo?

GMT (GMT, UTC+00:00) is 9 hours ahead of Tokyo (JST, UTC+09:00). The gap is currently +9h.

How do I convert GMT time to Tokyo time?

Add +9h to GMT local time. For example, 9:00 AM in GMT is 6:00 PM in Tokyo.

What time is it in Tokyo right now?

Tokyo 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 Tokyo 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 Tokyo.

Which is ahead, GMT or Tokyo?

GMT is 9 hours ahead of Tokyo. When it is 12:00 PM in GMT it is 9:00 PM in Tokyo.

Do GMT and Tokyo use different time zones?

GMT uses GMT at UTC+00:00, while Tokyo (Japan) uses JST at UTC+09:00. The IANA identifiers are Europe/London and Asia/Tokyo.

Does daylight saving time affect the GMT–Tokyo difference?

Neither zone observes daylight saving time, so the +9h offset between GMT and Tokyo 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 Tokyo?

Not normally. The +9h gap only pushes the date over for late-evening times.

What is the time difference between GMT and Tokyo?

Tokyo is +9h from GMT.

What timezone is GMT in?

GMT operates on its local timezone.

What timezone is Tokyo in?

Tokyo operates on Japan Standard Time (JST), which is 14 hours ahead of New York. As Asia's largest financial hub, Tokyo trading hours are crucial for global markets.

What are the business hours in Tokyo?

Standard business hours in Tokyo are 9:00 AM - 6:00 PM JST.

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.