Istanbul to London
-2hIstanbul
TRTSOURCELondon
BSTGreen rows indicate typical business hours (9 AM - 5 PM)
TRT and BST on the World Map
The map below highlights the TRT (Turkey Time) and BST (Greenwich Mean Time) timezone regions across the globe.
TRT – Turkey Time
UTC+03:00Turkey Time (TRT, UTC+03:00) is the single time zone used across Turkey, fixed year round since 2016.
- •Turkey has used a permanent UTC+03:00 since September 2016.
- •TRT is level with Moscow Standard Time and Arabia Standard Time all year.
- •Because Turkey kept summer time permanently, western cities see very late winter sunrises.
- •Turkey previously observed daylight saving time from 1973 to 2016.
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 Istanbul
WikipediaIstanbul operates on Turkey Time (TRT), UTC+3 year-round. As a transcontinental city, Istanbul bridges European and Asian business hours.
The Grand Bazaar is one of the world's oldest and largest covered markets with 4,000+ shops.
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: Istanbul to London
Istanbul runs on Türkiye Standard Time (TRT) at UTC+03:00. London runs on British Summer Time (BST) at UTC+01:00, also currently on daylight saving time. That puts Istanbul 2 hours behind London — a difference of -2h at the current offsets.
In practice, when it is 9:00 AM in Istanbul it is 7:00 AM in London. Midnight in Istanbul is 10:00 PM in London.London observes daylight saving time while Istanbul does not, so the gap narrows or widens by an hour part of the year.
Istanbul to London time conversion table
| Istanbul (TRT) | London (BST) | Day |
|---|---|---|
| 12:00 AM | 10:00 PM | previous day |
| 6:00 AM | 4:00 AM | same day |
| 7:00 AM | 5:00 AM | same day |
| 8:00 AM | 6:00 AM | same day |
| 9:00 AM | 7:00 AM | same day |
| 12:00 PM | 10:00 AM | same day |
| 3:00 PM | 1:00 PM | same day |
| 5:00 PM | 3:00 PM | same day |
| 6:00 PM | 4:00 PM | same day |
| 9:00 PM | 7:00 PM | same day |
Why people convert Istanbul to London time
- Scheduling a call from Istanbul to London: a 10:00 AM start in Istanbul lands at 8:00 AM in London, so you can confirm the slot without doing the arithmetic yourself.
- Finding shared working hours: both Istanbul and London are inside the 9-to-5 working day between 11:00 AM and 5:00 PM TRT time (9:00 AM–3:00 PM BST). That is roughly 6 hours of usable overlap.
- Booking travel or deliveries: tracking London local time against Istanbul keeps pickup windows and arrival estimates honest across the -2h offset.
- Always state the zone abbreviation, not just the hour. "3:00 PM TRT" is unambiguous; "3 PM" across a -2h gap is not.
- Block 11:00 AM–5:00 PM TRT as the recurring meeting window if you work primarily from Istanbul and need London colleagues present.
- London: Clocks fall back on Sun, Oct 25, 2026. Any meeting series spanning that date will shift by an hour in local time.
About TRT (Turkey Time)
Turkey Time (TRT) is fixed at UTC+03:00 all year. Turkey abolished seasonal clock changes in September 2016, moving to a permanent UTC+03:00 so the whole country stays on what was formerly summer time. That leaves Istanbul, which sits close to 29°E, on an offset well ahead of its solar time — sunrise in mid-winter comes after 08:30 local. TRT shares its offset with Moscow Standard Time, Arabia Standard Time and East Africa Time, so Istanbul is level with Moscow and Riyadh all year and one hour ahead of Central European Time during the European winter.
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 Istanbul and London
Both Istanbul and London sit inside the 9 AM – 5 PM working day between 11:00 AM–5:00 PM TRT, which is 9:00 AM–3:00 PM BST. That gives roughly 6 hours of shared time — the safest window for a live call or meeting.
Business hours overlap
Istanbul and London share 6 hours of working-hours overlap (11:00 AM–5:00 PM TRT), so scheduling a live meeting is straightforward.
Istanbul is 2 hours behind London (TRT UTC+03:00 → BST UTC+01:00). The shared working window is 11:00 AM–5:00 PM TRT. Remember to re-check around daylight-saving transitions.
🕐 Daylight Saving Time Info
Istanbul
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 Istanbul and London?
Istanbul (TRT, UTC+03:00) is 2 hours behind London (BST, UTC+01:00). The gap is currently -2h.
How do I convert Istanbul time to London time?
Add -2h to Istanbul local time. For example, 9:00 AM in Istanbul is 7:00 AM in London.
What time is it in London right now?
London uses BST at UTC+01:00. Use the live converter at the top of this page — it updates in real time and already accounts for the -2h offset from Istanbul.
What is the best time to call London from Istanbul?
Call between 11:00 AM and 5:00 PM TRT — that maps to 9:00 AM–3:00 PM BST and keeps both parties inside the working day.
Which is behind, Istanbul or London?
Istanbul is 2 hours behind London. When it is 12:00 PM in Istanbul it is 10:00 AM in London.
Do Istanbul and London use different time zones?
Istanbul (Turkey) uses TRT at UTC+03:00, while London (UK) uses BST at UTC+01:00. The IANA identifiers are Europe/Istanbul and Europe/London.
Does daylight saving time affect the Istanbul–London difference?
Yes at the moment: London is on daylight saving time and Istanbul is not, so the -2h gap shifts by an hour when exactly one of them changes clocks.
Which other cities share Istanbul's time zone?
TRT also covers Istanbul, Ankara, Izmir, Bursa, Antalya.
Which countries use TRT, Istanbul's zone?
TRT is used in Turkey.
Is there a day difference between Istanbul and London?
Not normally. The -2h gap only pushes the date over the previous day.
What is the time difference between Istanbul and London?
London is -2h from Istanbul.
What timezone is Istanbul in?
Istanbul operates on Turkey Time (TRT), UTC+3 year-round. As a transcontinental city, Istanbul bridges European and Asian business hours.
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 Istanbul?
Standard business hours in Istanbul are 9:00 AM - 6:00 PM TRT.
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 Istanbul and London?
The best overlap for a call is when both cities are in business hours. Istanbul works 9:00 AM - 6:00 PM TRT 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 Istanbul and London?
Istanbul uses TRY (₺) while London uses GBP (£). Check current exchange rates when planning travel or business between these cities.
How do Istanbul and London compare in size?
Istanbul has a population of approximately 15.5 million (metro: 15.8 million), while London has approximately 8.8 million (metro: 14.8 million).
What are the major landmarks in Istanbul and London?
Istanbul is known for Hagia Sophia, Blue Mosque, Topkapi Palace. London is famous for Big Ben, Tower Bridge, Buckingham Palace.
Do Istanbul and London have stock exchanges?
Yes. Istanbul has the Borsa Istanbul and London has the LSE (London Stock Exchange). The -2h time difference affects trading hour overlaps between these exchanges.
Which countries use TRT (Turkey Time)?
TRT is used in Turkey.
Does TRT observe daylight saving time?
No, TRT does not observe daylight saving time and remains at UTC+03:00 year-round.
What are some interesting facts about TRT?
Turkey has used a permanent UTC+03:00 since September 2016. TRT is level with Moscow Standard Time and Arabia Standard Time all year.
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 Istanbul, what time is it in London?
When it is 12:00 AM (midnight) in Istanbul (TRT), it is -2h later in London (GMT).
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