GMT to Lisbon
+1hGMT
GMTSOURCELisbon
WESTGreen rows indicate typical business hours (9 AM - 5 PM)
GMT and WEST on the World Map
The map below highlights the GMT (Greenwich Mean Time) and WEST (Western European 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.
WET – Western European Time
UTC+00:00Western European Time (WET) is the time zone for Portugal, Morocco, and the Canary Islands, same as UTC+00:00.
- •Portugal is the only mainland European country in the WET time zone.
- •The Canary Islands are on WET despite being part of Spain (which uses CET).
- •WET is identical to GMT and UTC+00:00.
About Lisbon
WikipediaLisbon operates on Western European Time (WET/WEST), same as London. As Portugal's capital and an emerging tech hub, Lisbon bridges European and Atlantic time zones.
Lisbon has 300 days of sunshine per year and is a major startup hub in Europe.
GMT to Lisbon Time Difference – Complete Guide
GMT runs on Greenwich Mean Time (GMT) at UTC+00:00. Lisbon runs on Western European Summer Time (WEST) at UTC+01:00, also currently on daylight saving time. That puts GMT 1 hour ahead of Lisbon — a difference of +1h at the current offsets.
In practice, when it is 9:00 AM in GMT it is 10:00 AM in Lisbon. Midnight in GMT is 1:00 AM in Lisbon.Lisbon observes daylight saving time while GMT does not, so the gap narrows or widens by an hour part of the year.
GMT to Lisbon time conversion table
| GMT (GMT) | Lisbon (WEST) | 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 Lisbon time
- Scheduling a call from GMT to Lisbon: a 10:00 AM start in GMT lands at 11:00 AM in Lisbon, so you can confirm the slot without doing the arithmetic yourself.
- Finding shared working hours: both GMT and Lisbon are inside the 9-to-5 working day between 9:00 AM and 4:00 PM GMT time (10:00 AM–5:00 PM WEST). That is roughly 7 hours of usable overlap.
- Watching a live event or market open: GMT viewers need 10:00 AM in Lisbon to catch a 9:00 AM start there, and 11:00 PM if the event is anchored to GMT.
- 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 Lisbon colleagues present.
- Lisbon: 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 WET (Western European Time)
Western European Time (WET) is used in Portugal, the Canary Islands (Spain), Morocco, and several other locations. It is equivalent to GMT/UTC. During summer, Portugal and the Canary Islands switch to WEST (Western European Summer Time, UTC+01:00).
Best time to call between GMT and Lisbon
Both GMT and Lisbon 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 WEST. That gives roughly 7 hours of shared time — the safest window for a live call or meeting.
Business hours overlap
GMT and Lisbon 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 Lisbon (GMT UTC+00:00 → WEST 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
Lisbon
☀ 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 Lisbon?
GMT (GMT, UTC+00:00) is 1 hour ahead of Lisbon (WEST, UTC+01:00). The gap is currently +1h.
How do I convert GMT time to Lisbon time?
Add +1h to GMT local time. For example, 9:00 AM in GMT is 10:00 AM in Lisbon.
What time is it in Lisbon right now?
Lisbon uses WEST 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 Lisbon from GMT?
Call between 9:00 AM and 4:00 PM GMT — that maps to 10:00 AM–5:00 PM WEST and keeps both parties inside the working day.
Which is ahead, GMT or Lisbon?
GMT is 1 hour ahead of Lisbon. When it is 12:00 PM in GMT it is 1:00 PM in Lisbon.
Do GMT and Lisbon use different time zones?
GMT uses GMT at UTC+00:00, while Lisbon (Portugal) uses WEST at UTC+01:00. The IANA identifiers are Europe/London and Europe/Lisbon.
Does daylight saving time affect the GMT–Lisbon difference?
Yes at the moment: Lisbon 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 Lisbon?
Not normally. The +1h gap only pushes the date over for late-evening times.
What is the time difference between GMT and Lisbon?
Lisbon is +1h from GMT.
What timezone is GMT in?
GMT operates on its local timezone.
What timezone is Lisbon in?
Lisbon operates on Western European Time (WET/WEST), same as London. As Portugal's capital and an emerging tech hub, Lisbon bridges European and Atlantic time zones.
What are the business hours in Lisbon?
Standard business hours in Lisbon are 9:00 AM - 6:00 PM WET.
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 WET timezone?
Major cities in the WET timezone include Lisbon, Porto, Casablanca, Las Palmas, Funchal, Rabat.
What is the UTC offset for WET?
Western European Time (WET) is at UTC+00:00. During daylight saving time, it shifts to WEST.
What should I know about the WET timezone?
Portugal is the only mainland European country in the WET time zone. The Canary Islands are on WET despite being part of Spain (which uses CET).
When is it midnight in GMT, what time is it in Lisbon?
When it is 12:00 AM (midnight) in GMT (GMT), it is +1h later in Lisbon (WET).
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