London to Riyadh
+2hLondon
GMTSOURCERiyadh
ASTGreen rows indicate typical business hours (9 AM - 5 PM)
GMT and AST on the World Map
The map below highlights the GMT (Greenwich Mean Time) and AST (Atlantic 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.
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.
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.
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.
The Saudi work week runs Sunday to Thursday; Friday-Saturday is the weekend.
London to Riyadh Time Difference – Complete Guide
London, UK operates on the Greenwich Mean Time (UTC+00:00). Riyadh, Saudi Arabia uses Atlantic Standard Time (UTC-04:00).
The time difference between London and Riyadh is 120 minutes (+2h). When it's noon in London, it's 02:00 PM in Riyadh.
Why Convert London to Riyadh Time?
The time difference of 2 hours between London and Riyadh can significantly impact business operations and personal communication. By using this converter, you can easily find the overlapping business hours and schedule your interactions when both parties are available.
Remember: Daylight Saving Time changes can affect the time difference between London and Riyadh. Always double-check the current offset before scheduling important events.
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 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.
Best Time to Call Between London and Riyadh
If you want to reach someone in Riyadh during standard business hours (9 AM – 5 PM AST), the best time to call from London would be:
- Riyadh 9:00 AM = London 07:00 AM
- Riyadh 12:00 PM = London 10:00 AM
- Riyadh 5:00 PM = London 03:00 PM
Business Hours Overlap
London and Riyadh have a significant business hours overlap (6 hours), making real-time collaboration easy during standard working hours.
As a final note, managing the +2h difference between London and Riyadh is simple with the right tools. Keep this page handy for all your future time conversion needs.
🕐 Daylight Saving Time Info
London
☀ Currently in DST
Standard: UTC+00:00 · DST: UTC+01:00
Clocks fall back on Sun, Oct 25, 2026
Riyadh
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 Riyadh?
Riyadh is +2h 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 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 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 Riyadh?
Standard business hours in Riyadh are 8:00 AM - 4:00 PM AST (Sunday-Thursday).
What is the best time to schedule a call between London and Riyadh?
The best overlap for a call is when both cities are in business hours. London works 9:00 AM - 5:00 PM GMT and Riyadh works 8:00 AM - 4:00 PM AST (Sunday-Thursday) (+2h difference). Try scheduling during the overlapping window for maximum convenience.
What currencies are used in London and Riyadh?
London uses GBP (£) while Riyadh uses SAR (﷼). Check current exchange rates when planning travel or business between these cities.
How do London and Riyadh compare in size?
London has a population of approximately 8.8 million (metro: 14.8 million), while Riyadh has approximately 7.7 million (metro: 7.7 million).
What are the major landmarks in London and Riyadh?
London is known for Big Ben, Tower Bridge, Buckingham Palace. Riyadh is famous for Kingdom Centre, Masmak Fortress, National Museum.
Do London and Riyadh have stock exchanges?
Yes. London has the LSE (London Stock Exchange) and Riyadh has the Tadawul (Saudi Stock Exchange). The +2h 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 AST timezone?
Major cities in the AST timezone include Halifax, San Juan, Santo Domingo, Caracas, La Paz, Fredericton, Charlottetown.
What is the UTC offset for AST?
Atlantic Standard Time (AST) is at UTC-04:00. During daylight saving time, it shifts to ADT.
What should I know about the AST timezone?
Puerto Rico uses AST year-round and does not observe DST. AST is 1 hour ahead of EST.
When is it midnight in London, what time is it in Riyadh?
When it is 12:00 AM (midnight) in London (GMT), it is +2h later in Riyadh (AST).
Related Developer Tools
Explore more tools that work great with timezone conversions for international teams: