Does it handle Daylight Saving Time?

Yes, the tool automatically adjusts for Daylight Saving Time based on the specific date you select, ensuring accurate conversions year-round.

Can I add multiple cities?

Yes, you can add as many cities as you need to the dashboard to compare times across your entire global network simultaneously.

GMT to London

+1h

GMT

GMTSOURCE

UTC+01:00☀ DST active

HH12

MM00

12:00 (24-hr)

12 AM6 AM12 PM6 PM12 AM

London

BST

UK · UTC+01:00☀ DST active

HH01

MM00

13:00 (24-hr)

12 AM6 AM12 PM6 PM12 AM

Quick Reference

Time Conversion Table

GMT

London

12:00 AM

2:00 AM

4:00 AM

6:00 AM

8:00 AM

10:00 AM

12:00 PM

2:00 PM

4:00 PM

6:00 PM

8:00 PM

10:00 PM

Green rows indicate typical business hours (9 AM - 5 PM)

GMT and BST on the World Map

The map below highlights the GMT (Greenwich Mean Time) and BST (Greenwich Mean Time) timezone regions across the globe.

GMT Zone

→

BST Zone

Explore all world timezones interactively →

GMT – Greenwich Mean Time

UTC+00:00

Greenwich Mean Time (GMT) is the mean solar time at the Royal Observatory in Greenwich, London. It is the same as UTC+00:00.

Countries in GMT

United KingdomIrelandIcelandPortugal (mainland)GhanaSenegalMaliMauritaniaGambiaGuineaSierra LeoneLiberiaIvory CoastBurkina FasoMorocco (historically)

Major Cities in GMT

LondonDublinLisbonAccraReykjavikEdinburghCasablancaDakarBamakoAbidjanConakryFreetownMonrovia

Key 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.
•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.

Daylight Saving:Yes – switches to BST

Learn more about GMT on Wikipedia

GMT – Greenwich Mean Time

UTC+00:00

Greenwich Mean Time (GMT) is the mean solar time at the Royal Observatory in Greenwich, London. It is the same as UTC+00:00.

Countries in GMT

United KingdomIrelandIcelandPortugal (mainland)GhanaSenegalMaliMauritaniaGambiaGuineaSierra LeoneLiberiaIvory CoastBurkina FasoMorocco (historically)

Major Cities in GMT

LondonDublinLisbonAccraReykjavikEdinburghCasablancaDakarBamakoAbidjanConakryFreetownMonrovia

Key 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.
•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.

Daylight Saving:Yes – switches to BST

Learn more about GMT on Wikipedia

About London

Wikipedia

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.

Population:8.8 million

Metro:14.8 million

Business Hours:9:00 AM - 5:00 PM GMT

Currency:GBP (£)

Stock Exchange:LSE (London Stock Exchange)

Key Landmarks

Big BenTower BridgeBuckingham PalaceLondon EyeThe Shard

Did You Know?

Big Ben is actually the name of the bell inside the Elizabeth Tower, not the tower itself.

Learn more about BST timezone →

Understanding the +1h Gap: GMT vs London

GMT runs on Greenwich Mean Time (GMT) at UTC+00:00. London runs on British Summer Time (BST) at UTC+01:00, also currently on daylight saving time. That puts GMT 1 hour ahead of London — a difference of +1h at the current offsets.

In practice, when it is 9:00 AM in GMT it is 10:00 AM in London. Midnight in GMT is 1:00 AM in London.London observes daylight saving time while GMT does not, so the gap narrows or widens by an hour part of the year.

GMT to London time conversion table

GMT (GMT)	London (BST)	Day
12:00 AM	1:00 AM	same day
6:00 AM	7:00 AM	same day
7:00 AM	8:00 AM	same day
8:00 AM	9:00 AM	same day
9:00 AM	10:00 AM	same day
12:00 PM	1:00 PM	same day
3:00 PM	4:00 PM	same day
5:00 PM	6:00 PM	same day
6:00 PM	7:00 PM	same day
9:00 PM	10:00 PM	same day

Why people convert GMT to London time

Scheduling a call from GMT to London: a 10:00 AM start in GMT lands at 11:00 AM in London, so you can confirm the slot without doing the arithmetic yourself.
Finding shared working hours: both GMT and London are inside the 9-to-5 working day between 9:00 AM and 4:00 PM GMT time (10:00 AM–5:00 PM BST). That is roughly 7 hours of usable overlap.
Keeping family and friends in sync: knowing that 8:00 PM in GMT is 9:00 PM in London makes it easy to avoid calling at 3 AM.

Always state the zone abbreviation, not just the hour. "3:00 PM GMT" is unambiguous; "3 PM" across a +1h gap is not.
Block 9:00 AM–4:00 PM GMT as the recurring meeting window if you work primarily from GMT 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 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 GMT (Greenwich Mean Time)

Best time to call between GMT and London

Both GMT and London sit inside the 9 AM – 5 PM working day between 9:00 AM–4:00 PM GMT, which is 10:00 AM–5:00 PM BST. That gives roughly 7 hours of shared time — the safest window for a live call or meeting.

Business hours overlap

GMT and London share 7 hours of working-hours overlap (9:00 AM–4:00 PM GMT), so scheduling a live meeting is straightforward.

GMT is 1 hour ahead of London (GMT UTC+00:00 → BST UTC+01:00). The shared working window is 9:00 AM–4:00 PM GMT. Remember to re-check around daylight-saving transitions.

🕐 Daylight Saving Time Info

GMT

☀ Currently in DST

Standard: UTC+00:00 · DST: UTC+01:00

Clocks fall back on Sun, Oct 25, 2026

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:

⏳

History of Timekeeping

From sundials to atomic clocks - 5000 years of measuring time

🌍

How Time Zones Work

UTC, offsets, and why zones don't follow straight lines

☀️

Daylight Saving Time

DST dates, which countries observe it, and the ongoing debate

Frequently Asked Questions

What is the time difference between GMT and London?

GMT (GMT, UTC+00:00) is 1 hour ahead of London (BST, UTC+01:00). The gap is currently +1h.

How do I convert GMT time to London time?

Add +1h to GMT local time. For example, 9:00 AM in GMT is 10:00 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 +1h offset from GMT.

What is the best time to call London from GMT?

Call between 9:00 AM and 4:00 PM GMT — that maps to 10:00 AM–5:00 PM BST and keeps both parties inside the working day.

Which is ahead, GMT or London?

GMT is 1 hour ahead of London. When it is 12:00 PM in GMT it is 1:00 PM in London.

Do GMT and London use different time zones?

GMT uses GMT at UTC+00:00, while London (UK) uses BST at UTC+01:00. They actually share the same IANA zone.

Does daylight saving time affect the GMT–London difference?

Yes at the moment: London is on daylight saving time and GMT is not, so the +1h gap shifts by an hour when exactly one of them changes clocks.

Which other cities share GMT's time zone?

GMT also covers London, Dublin, Lisbon, Accra, Reykjavik, Edinburgh, Casablanca, Dakar and 5 more.

Which countries use GMT, GMT's zone?

GMT is used in United Kingdom, Ireland, Iceland, Portugal (mainland), Ghana, Senegal, Mali, Mauritania and 7 more.

Is there a day difference between GMT and London?

Not normally. The +1h gap only pushes the date over for late-evening times.

What is the time difference between GMT and London?

London is +1h from GMT.

What timezone is GMT in?

GMT operates on its local timezone.

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 London?

Standard business hours in London are 9:00 AM - 5:00 PM GMT.

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 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.