GMT to UTC
+0hGMT
GMTSOURCEUTC
UTCGreen rows indicate typical business hours (9 AM - 5 PM)
GMT and UTC on the World Map
The map below highlights the GMT (Greenwich Mean Time) and UTC (Coordinated Universal 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.
UTC – Coordinated Universal Time
UTC+00:00Coordinated Universal Time (UTC) is the world's primary time standard, used as the basis for civil time worldwide.
- •UTC is the basis for all civil time zones worldwide.
- •The abbreviation 'UTC' is a compromise between English (CUT) and French (TUC).
- •UTC is based on atomic clocks and is accurate to within a nanosecond per day.
- •Servers and databases worldwide store timestamps in UTC to avoid timezone confusion.
- •Leap seconds are occasionally added to UTC to keep it aligned with Earth's rotation.
Time Conversion Guide: GMT to UTC
GMT runs on Greenwich Mean Time (GMT) at UTC+00:00. UTC runs on Coordinated Universal Time (UTC) at UTC+00:00. That puts GMT no time difference UTC — a difference of +0h at the current offsets.
In practice, when it is 9:00 AM in GMT it is 9:00 AM in UTC. Midnight in GMT is 12:00 AM in UTC. Neither zone observes daylight saving time, so the offset between them stays constant all year.
GMT to UTC time conversion table
| GMT (GMT) | UTC (UTC) | Day |
|---|---|---|
| 12:00 AM | 12:00 AM | same day |
| 6:00 AM | 6:00 AM | same day |
| 7:00 AM | 7:00 AM | same day |
| 8:00 AM | 8:00 AM | same day |
| 9:00 AM | 9:00 AM | same day |
| 12:00 PM | 12:00 PM | same day |
| 3:00 PM | 3:00 PM | same day |
| 5:00 PM | 5:00 PM | same day |
| 6:00 PM | 6:00 PM | same day |
| 9:00 PM | 9:00 PM | same day |
Why people convert GMT to UTC time
- Scheduling a call from GMT to UTC: a 10:00 AM start in GMT lands at 10:00 AM in UTC, so you can confirm the slot without doing the arithmetic yourself.
- Finding shared working hours: both GMT and UTC are inside the 9-to-5 working day between 9:00 AM and 5:00 PM GMT time (9:00 AM–5:00 PM UTC). That is roughly 8 hours of usable overlap.
- Booking travel or deliveries: tracking UTC local time against GMT keeps pickup windows and arrival estimates honest across the +0h offset.
- Always state the zone abbreviation, not just the hour. "3:00 PM GMT" is unambiguous; "3 PM" across a +0h gap is not.
- Block 9:00 AM–5:00 PM GMT as the recurring meeting window if you work primarily from GMT and need UTC colleagues present.
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 UTC (Coordinated Universal Time)
Coordinated Universal Time (UTC) is the primary time standard by which the world regulates clocks and time. It is effectively the successor to GMT and is based on International Atomic Time with leap seconds added to keep it synchronized with Earth's rotation. UTC is used in aviation, computing, navigation, weather forecasting, and the International Space Station. Most programming languages and databases store timestamps in UTC.
Best time to call between GMT and UTC
Both GMT and UTC sit inside the 9 AM – 5 PM working day between 9:00 AM–5:00 PM GMT, which is 9:00 AM–5:00 PM UTC. That gives roughly 8 hours of shared time — the safest window for a live call or meeting.
Business hours overlap
GMT and UTC share 8 hours of working-hours overlap (9:00 AM–5:00 PM GMT), so scheduling a live meeting is straightforward.
GMT is no time difference UTC (GMT UTC+00:00 → UTC UTC+00:00). The shared working window is 9:00 AM–5:00 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
UTC
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 GMT and UTC?
GMT (GMT, UTC+00:00) is no time difference UTC (UTC, UTC+00:00). The gap is currently +0h.
How do I convert GMT time to UTC time?
Add +0h to GMT local time. For example, 9:00 AM in GMT is 9:00 AM in UTC.
What time is it in UTC right now?
UTC uses UTC at UTC+00:00. Use the live converter at the top of this page — it updates in real time and already accounts for the +0h offset from GMT.
What is the best time to call UTC from GMT?
Call between 9:00 AM and 5:00 PM GMT — that maps to 9:00 AM–5:00 PM UTC and keeps both parties inside the working day.
Which is ahead, GMT or UTC?
GMT and UTC are currently on the same clock.
Does daylight saving time affect the GMT–UTC difference?
Neither zone observes daylight saving time, so the +0h offset between GMT and UTC is fixed all year.
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.
What is the time difference between GMT and UTC?
UTC is +0h from GMT.
What timezone is GMT in?
GMT operates on its local timezone.
What timezone is UTC in?
UTC 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 UTC timezone?
Major cities in the UTC timezone include London, Dublin, Reykjavik, Accra, Lisbon, Dakar.
What is the UTC offset for UTC?
Coordinated Universal Time (UTC) is at UTC+00:00.
What should I know about the UTC timezone?
UTC is the basis for all civil time zones worldwide. The abbreviation 'UTC' is a compromise between English (CUT) and French (TUC).
When is it midnight in GMT, what time is it in UTC?
When it is 12:00 AM (midnight) in GMT (GMT), it is +0h later in UTC (UTC).
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See every conversion from GMT →·See every conversion from UTC →