Riyadh to London
-2hRiyadh
ASTSOURCELondon
GMTGreen rows indicate typical business hours (9 AM - 5 PM)
AST and GMT on the World Map
The map below highlights the AST (Atlantic Standard Time) and GMT (Greenwich Mean Time) timezone regions across the globe.
AST – Atlantic Standard Time
UTC-04:00Atlantic Standard Time (AST) is the time zone for the Canadian Atlantic provinces and the Caribbean, 4 hours behind UTC.
- •Puerto Rico uses AST year-round and does not observe DST.
- •AST is 1 hour ahead of EST.
- •Halifax, the capital of Nova Scotia, is the largest city in AST Canada.
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 Riyadh
WikipediaRiyadh operates on Arabia Standard Time (AST), UTC+3. As OPEC's de facto capital and home to Tadawul, Riyadh time impacts global energy markets.
Riyadh is growing rapidly as part of Saudi Vision 2030 modernization.
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.
London was the first city to have an underground railway, opening in 1863.
Everything You Need to Know About Riyadh and London Time
Riyadh, Saudi Arabia operates on the Atlantic Standard Time (UTC-04:00). London, UK uses Greenwich Mean Time (UTC+00:00).
The time difference between Riyadh and London is 120 minutes (+2h). When it's noon in Riyadh, it's 10:00 AM in London.
Why Convert Riyadh to London Time?
Navigating the time gap between Riyadh and London requires careful planning. With a difference of 2 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 London.
Pro Tip: If you frequently communicate with people in London from Riyadh, consider adding a dual-clock widget to your phone or computer to keep track of the 2-hour difference at a glance.
About AST (Atlantic Standard Time)
Atlantic Standard Time (AST) covers Canada's Atlantic provinces (Nova Scotia, New Brunswick, Prince Edward Island, and most of Labrador), as well as several Caribbean nations. Puerto Rico and the US Virgin Islands use AST year-round without daylight saving time. The Canadian provinces switch to Atlantic Daylight Time (ADT) in summer.
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 Riyadh 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 Riyadh would be:
- London 9:00 AM = Riyadh 11:00 AM
- London 12:00 PM = Riyadh 02:00 PM
- London 5:00 PM = Riyadh 07:00 PM
Business Hours Overlap
Riyadh and London have a significant business hours overlap (6 hours), making real-time collaboration easy during standard working hours.
In summary, the -2h time difference between Riyadh 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
Riyadh
Does not observe DST
London
☀ Currently in DST
Standard: UTC+00:00 · DST: UTC+01:00
Clocks fall back on Sun, Oct 25, 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 Riyadh and London?
London is -2h from Riyadh.
What timezone is Riyadh in?
Riyadh operates on Arabia Standard Time (AST), UTC+3. As OPEC's de facto capital and home to Tadawul, Riyadh time impacts global energy markets.
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 Riyadh?
Standard business hours in Riyadh are 8:00 AM - 4:00 PM AST (Sunday-Thursday).
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 Riyadh and London?
The best overlap for a call is when both cities are in business hours. Riyadh works 8:00 AM - 4:00 PM AST (Sunday-Thursday) and London works 9:00 AM - 5:00 PM GMT (-2h difference). Try scheduling during the overlapping window for maximum convenience.
What currencies are used in Riyadh and London?
Riyadh uses SAR (﷼) while London uses GBP (£). Check current exchange rates when planning travel or business between these cities.
How do Riyadh and London compare in size?
Riyadh has a population of approximately 7.7 million (metro: 7.7 million), while London has approximately 8.8 million (metro: 14.8 million).
What are the major landmarks in Riyadh and London?
Riyadh is known for Kingdom Centre, Masmak Fortress, National Museum. London is famous for Big Ben, Tower Bridge, Buckingham Palace.
Do Riyadh and London have stock exchanges?
Yes. Riyadh has the Tadawul (Saudi Stock Exchange) and London has the LSE (London Stock Exchange). The -2h time difference affects trading hour overlaps between these exchanges.
Which countries use AST (Atlantic Standard Time)?
AST is used in Canada (Atlantic provinces), Puerto Rico, US Virgin Islands, Dominican Republic, Venezuela, Bolivia, and 2 more countries.
Does AST observe daylight saving time?
Yes, AST switches to ADT during summer months.
What are some interesting facts about AST?
Puerto Rico uses AST year-round and does not observe DST. AST is 1 hour ahead of EST.
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 Riyadh, what time is it in London?
When it is 12:00 AM (midnight) in Riyadh (AST), it is -2h later in London (GMT).
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