London to Osaka
+9hLondon
GMTSOURCEOsaka
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.
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.
Greenwich Mean Time (GMT) is defined by the Prime Meridian at the Royal Observatory in Greenwich, London.
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.
Comparing Time Zones: London and Osaka
London, UK operates on the Greenwich Mean Time (UTC+00:00). Osaka, Japan uses Japan Standard Time (UTC+09:00).
The time difference between London and Osaka is 540 minutes (+9h). When it's noon in London, it's 09:00 PM in Osaka.
Why Convert London to Osaka Time?
Navigating the time gap between London and Osaka requires careful planning. With a difference of 9 hours, finding a suitable time for both locations is essential for effective collaboration. This tool simplifies the process, allowing you to instantly see the corresponding time in Osaka.
Tip: When scheduling a meeting, always confirm the time zone with your counterpart in Osaka. The 9-hour difference can easily lead to confusion if not explicitly stated.
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 London and Osaka
If you want to reach someone in Osaka during standard business hours (9 AM – 5 PM JST), the best time to call from London would be:
- Osaka 9:00 AM = London 12:00 AM
- Osaka 12:00 PM = London 03:00 AM
- Osaka 5:00 PM = London 08:00 AM
Business Hours Overlap
London and Osaka 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.
Ultimately, understanding the +9h difference between London and Osaka empowers you to coordinate better. Whether for business or personal reasons, this tool ensures you're always on time.
🕐 Daylight Saving Time Info
London
❄ Currently in Standard Time
Standard: UTC+00:00 · DST: UTC+01:00
Clocks spring forward on Sun, Mar 29, 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:
Frequently Asked Questions
What is the time difference between London and Osaka?
Osaka is +9h from London.
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 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 London?
Standard business hours in London are 9:00 AM - 5:00 PM GMT.
What are the business hours in Osaka?
Standard business hours in Osaka are 9:00 AM - 6:00 PM JST.
What is the best time to schedule a call between London and Osaka?
The best overlap for a call is when both cities are in business hours. London works 9:00 AM - 5:00 PM GMT and Osaka works 9:00 AM - 6:00 PM JST (+9h difference). Try scheduling during the overlapping window for maximum convenience.
What currencies are used in London and Osaka?
London uses GBP (£) while Osaka uses JPY (¥). Check current exchange rates when planning travel or business between these cities.
How do London and Osaka compare in size?
London has a population of approximately 8.8 million (metro: 14.8 million), while Osaka has approximately 2.8 million (metro: 19 million).
What are the major landmarks in London and Osaka?
London is known for Big Ben, Tower Bridge, Buckingham Palace. Osaka is famous for Osaka Castle, Dotonbori, Universal Studios Japan.
Do London and Osaka have stock exchanges?
Yes. London has the LSE (London Stock Exchange) and Osaka has the OSE (Osaka Exchange - derivatives). The +9h time difference affects trading hour overlaps between these exchanges.
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 London, what time is it in Osaka?
When it is 12:00 AM (midnight) in London (GMT), it is +9h later in Osaka (JST).
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