GMT to United Kingdom
+1hGMT
GMTSOURCEUnited Kingdom
BSTGreen 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 – 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.
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.
GMT vs United Kingdom: Offsets, DST and Best Call Times
GMT runs on Greenwich Mean Time (GMT) at UTC+00:00. United Kingdom runs on British Summer Time (BST) at UTC+01:00, also currently on daylight saving time. That puts GMT 1 hour ahead of United Kingdom — a difference of +1h at the current offsets.
In practice, when it is 9:00 AM in GMT it is 10:00 AM in United Kingdom. Midnight in GMT is 1:00 AM in United Kingdom.United Kingdom observes daylight saving time while GMT does not, so the gap narrows or widens by an hour part of the year.
GMT to United Kingdom time conversion table
| GMT (GMT) | United Kingdom (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 United Kingdom time
- Scheduling a call from GMT to United Kingdom: a 10:00 AM start in GMT lands at 11:00 AM in United Kingdom, so you can confirm the slot without doing the arithmetic yourself.
- Finding shared working hours: both GMT and United Kingdom 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.
- Booking travel or deliveries: tracking United Kingdom local time against GMT keeps pickup windows and arrival estimates honest across the +1h offset.
- 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 United Kingdom colleagues present.
- United Kingdom: 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)
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 GMT and United Kingdom
Both GMT and United Kingdom 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 United Kingdom 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 United Kingdom (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
United Kingdom
☀ 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 GMT and United Kingdom?
GMT (GMT, UTC+00:00) is 1 hour ahead of United Kingdom (BST, UTC+01:00). The gap is currently +1h.
How do I convert GMT time to United Kingdom time?
Add +1h to GMT local time. For example, 9:00 AM in GMT is 10:00 AM in United Kingdom.
What time is it in United Kingdom right now?
United Kingdom 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 United Kingdom 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 United Kingdom?
GMT is 1 hour ahead of United Kingdom. When it is 12:00 PM in GMT it is 1:00 PM in United Kingdom.
Do GMT and United Kingdom use different time zones?
GMT uses GMT at UTC+00:00, while United Kingdom (United Kingdom) uses BST at UTC+01:00. They actually share the same IANA zone.
Does daylight saving time affect the GMT–United Kingdom difference?
Yes at the moment: United Kingdom 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 United Kingdom?
Not normally. The +1h gap only pushes the date over for late-evening times.
What is the time difference between GMT and United Kingdom?
United Kingdom is +1h from GMT.
What timezone is GMT in?
GMT operates on its local timezone.
What timezone is United Kingdom in?
United Kingdom operates on its local timezone.
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.
When is it midnight in GMT, what time is it in United Kingdom?
When it is 12:00 AM (midnight) in GMT (GMT), it is +1h later in United Kingdom (GMT).
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