Osaka to London
-9hOsaka
JSTSOURCELondon
GMTGreen rows indicate typical business hours (9 AM - 5 PM)
JST and GMT on the World Map
The map below highlights the JST (Japan Standard Time) and GMT (Greenwich Mean 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.
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.
About Osaka
WikipediaOsaka operates on Japan Standard Time (JST), UTC+9. As Japan's second economic center and a manufacturing hub, Osaka shares business hours with Tokyo.
Osaka Castle was originally built in 1583 and has been rebuilt several times.
About London
WikipediaLondon, where Greenwich Mean Time (GMT) originates, is the world's leading financial center alongside New York. The city bridges European and American business hours.
Big Ben is actually the name of the bell inside the Elizabeth Tower, not the tower itself.
Time Conversion Guide: Osaka to London
Osaka, Japan operates on the Japan Standard Time (UTC+09:00). London, UK uses Greenwich Mean Time (UTC+00:00).
The time difference between Osaka and London is 540 minutes (+9h). When it's noon in Osaka, it's 03:00 AM in London.
Why Convert Osaka to London Time?
When planning a meeting or scheduling a call between Osaka and London, it's crucial to account for the 9-hour time difference. Whether you're coordinating with remote teams, calling family, or setting up an international conference, knowing the exact time in London helps avoid missed connections.
Remember: Daylight Saving Time changes can affect the time difference between Osaka and London. Always double-check the current offset before scheduling important events.
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 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.
Best Time to Call Between Osaka and London
If you want to reach someone in London during standard business hours (9 AM – 5 PM GMT), the best time to call from Osaka would be:
- London 9:00 AM = Osaka 06:00 PM
- London 12:00 PM = Osaka 09:00 PM
- London 5:00 PM = Osaka 02:00 AM
Business Hours Overlap
Osaka and London have minimal business hours overlap due to the +9h time difference. Teams may need to schedule early morning or late evening meetings for real-time collaboration.
In summary, the -9h time difference between Osaka and London means you need to plan carefully. Use this page as your go-to reference for quick and accurate time conversions.
🕐 Daylight Saving Time Info
Osaka
Does not observe DST
London
❄ Currently in Standard Time
Standard: UTC+00:00 · DST: UTC+01:00
Clocks spring forward on Sun, Mar 29, 2026
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 Osaka and London?
London is -9h from Osaka.
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 timezone is London in?
London, where Greenwich Mean Time (GMT) originates, is the world's leading financial center alongside New York. The city bridges European and American business hours.
What are the business hours in Osaka?
Standard business hours in Osaka are 9:00 AM - 6:00 PM JST.
What are the business hours in London?
Standard business hours in London are 9:00 AM - 5:00 PM GMT.
What is the best time to schedule a call between Osaka and London?
The best overlap for a call is when both cities are in business hours. Osaka works 9:00 AM - 6:00 PM JST and London works 9:00 AM - 5:00 PM GMT (-9h difference). Try scheduling during the overlapping window for maximum convenience.
What currencies are used in Osaka and London?
Osaka uses JPY (¥) while London uses GBP (£). Check current exchange rates when planning travel or business between these cities.
How do Osaka and London compare in size?
Osaka has a population of approximately 2.8 million (metro: 19 million), while London has approximately 8.8 million (metro: 14.8 million).
What are the major landmarks in Osaka and London?
Osaka is known for Osaka Castle, Dotonbori, Universal Studios Japan. London is famous for Big Ben, Tower Bridge, Buckingham Palace.
Do Osaka and London have stock exchanges?
Yes. Osaka has the OSE (Osaka Exchange - derivatives) and London has the LSE (London Stock Exchange). The -9h time difference affects trading hour overlaps between these exchanges.
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 GMT timezone?
Major cities in the GMT timezone include London, Dublin, Lisbon, Accra, Reykjavik, Edinburgh, Casablanca, Dakar.
What is the UTC offset for GMT?
Greenwich Mean Time (GMT) is at UTC+00:00. During daylight saving time, it shifts to BST.
What should I know about the GMT timezone?
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.
When is it midnight in Osaka, what time is it in London?
When it is 12:00 AM (midnight) in Osaka (JST), it is -9h later in London (GMT).
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