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).

United Kingdom to Osaka

+8h

United Kingdom

BSTSOURCE

UTC+01:00☀ DST active

HH12

MM00

12:00 (24-hr)

12 AM6 AM12 PM6 PM12 AM

Osaka

JST

Japan · UTC+09:00

HH08

MM00

20:00 (24-hr)

12 AM6 AM12 PM6 PM12 AM

Quick Reference

Time Conversion Table

United Kingdom

Osaka

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)

BST and JST on the World Map

The map below highlights the BST (Greenwich Mean Time) and JST (Japan Standard Time) timezone regions across the globe.

BST 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 Osaka

Wikipedia

Osaka operates on Japan Standard Time (JST), UTC+9. As Japan's second economic center and a manufacturing hub, Osaka shares business hours with Tokyo.

Population:2.8 million

Metro:19 million

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

Currency:JPY (¥)

Stock Exchange:OSE (Osaka Exchange - derivatives)

Key Landmarks

Osaka CastleDotonboriUniversal Studios JapanShitennoji TempleUmeda Sky Building

Did You Know?

Osaka Castle was originally built in 1583 and has been rebuilt several times.

Learn more about JST timezone →

Everything You Need to Know About United Kingdom and Osaka Time

United Kingdom runs on British Summer Time (BST) at UTC+01:00, currently observing daylight saving time. Osaka runs on Japan Standard Time (JST) at UTC+09:00. That puts United Kingdom 8 hours ahead of Osaka — a difference of +8h at the current offsets.

In practice, when it is 9:00 AM in United Kingdom it is 5:00 PM in Osaka. Midnight in United Kingdom is 8:00 AM in Osaka.United Kingdom observes daylight saving time while Osaka does not, so the gap narrows or widens by an hour part of the year.

United Kingdom to Osaka time conversion table

United Kingdom (BST)	Osaka (JST)	Day
12:00 AM	8:00 AM	same day
6:00 AM	2:00 PM	same day
7:00 AM	3:00 PM	same day
8:00 AM	4:00 PM	same day
9:00 AM	5:00 PM	same day
12:00 PM	8:00 PM	same day
3:00 PM	11:00 PM	same day
5:00 PM	1:00 AM	next day
6:00 PM	2:00 AM	next day
9:00 PM	5:00 AM	next day

Why people convert United Kingdom to Osaka time

Scheduling a call from United Kingdom to Osaka: a 10:00 AM start in United Kingdom lands at 6:00 PM in Osaka, so you can confirm the slot without doing the arithmetic yourself.
Handling a +8h gap: United Kingdom and Osaka 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 Osaka is 5:00 PM in United Kingdom.
Watching a live event or market open: United Kingdom viewers need 5:00 PM in Osaka to catch a 9:00 AM start there, and 4:00 PM if the event is anchored to United Kingdom.

Always state the zone abbreviation, not just the hour. "3:00 PM BST" 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 United Kingdom takes the early slot, the next week Osaka does.
United Kingdom: Clocks fall back on Sun, Oct 25, 2026. Re-check this page after that date because the offset changes and so does the +8h gap.

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 United Kingdom and Osaka

With a +8h offset there is no overlap inside a normal 9 AM – 5 PM day. Osaka opens at 9:00 AM JST, which is 5:00 PM in United Kingdom, so real-time calls need an early-morning or late-evening slot on one side.

Business hours overlap

United Kingdom and Osaka have no shared working hours because of the +8h gap. Teams need to alternate early starts or rely on asynchronous handovers.

United Kingdom is 8 hours ahead of Osaka (BST UTC+01:00 → 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

United Kingdom

☀ Currently in DST

Standard: UTC+00:00 · DST: UTC+01:00

Clocks fall back on Sun, Oct 25, 2026

Osaka

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 United Kingdom and Osaka?

United Kingdom (BST, UTC+01:00) is 8 hours ahead of Osaka (JST, UTC+09:00). The gap is currently +8h.

How do I convert United Kingdom time to Osaka time?

Add +8h to United Kingdom local time. For example, 9:00 AM in United Kingdom is 5:00 PM in Osaka.

What time is it in Osaka right now?

Osaka 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 +8h offset from United Kingdom.

What is the best time to call Osaka from United Kingdom?

There is no shared working-hours window because of the +8h gap. The closest option is 1:00 PM in United Kingdom, which is 9:00 PM in Osaka.

Which is ahead, United Kingdom or Osaka?

United Kingdom is 8 hours ahead of Osaka. When it is 12:00 PM in United Kingdom it is 8:00 PM in Osaka.

Do United Kingdom and Osaka use different time zones?

United Kingdom (United Kingdom) uses BST at UTC+01:00, while Osaka (Japan) uses JST at UTC+09:00. The IANA identifiers are Europe/London and Asia/Tokyo.

Does daylight saving time affect the United Kingdom–Osaka difference?

Yes at the moment: United Kingdom is on daylight saving time and Osaka is not, so the +8h gap shifts by an hour when exactly one of them changes clocks.

Which other cities share United Kingdom's time zone?

BST also covers London, Dublin, Lisbon, Accra, Reykjavik, Edinburgh, Casablanca, Dakar and 5 more.

Which countries use BST, United Kingdom's zone?

BST is used in United Kingdom, Ireland, Iceland, Portugal (mainland), Ghana, Senegal, Mali, Mauritania and 7 more.

Is there a day difference between United Kingdom and Osaka?

Not normally. The +8h gap only pushes the date over for late-evening times.

What is the time difference between United Kingdom and Osaka?

Osaka is +8h from United Kingdom.

What timezone is United Kingdom in?

United Kingdom operates on its local timezone.

What timezone is Osaka in?

Osaka operates on Japan Standard Time (JST), UTC+9. As Japan's second economic center and a manufacturing hub, Osaka shares business hours with Tokyo.

What are the business hours in Osaka?

Standard business hours in Osaka 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.