Porto to GMT Time Converter
The United Kingdom is on summer time: BST (UTC+1) until Sun, Oct 25.
Iceland and Ghana stay on GMT (UTC+0).
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Quick answers
Selected conversion
1:00 pm13:00 WEST (UTC+1), Oct 14, 2026 = 12:00 pm12:00 GMT (UTC+0), Oct 14, 2026
Porto is 1 hour ahead of GMT.
How the time difference changes
For most of the year, Porto is 1 hour ahead of GMT. From Oct 25, 2026 to Mar 28, 2027, Porto and GMT have the same time.
For most of the year, working hours of 9:00 am to 5:00 pm in Porto correspond to 8:00 am to 4:00 pm in GMT. At other times of the year, working hours of 9:00 am to 5:00 pm in Porto correspond to 9:00 am to 5:00 pm in GMT.For most of the year, working hours of 09:00 to 17:00 in Porto correspond to 08:00 to 16:00 in GMT. At other times of the year, working hours of 09:00 to 17:00 in Porto correspond to 09:00 to 17:00 in GMT.
Compare Porto time with GMT time, including current local time, UTC offsets, time difference, daylight saving changes, working hours, and shareable meeting times.
Time Difference
WEST (Western European Summer Time) is 1 hour ahead of Greenwich Mean Time.
1:00 pm13:00 in Porto, Portugal is 12:00 pm12:00 in GMT
Porto to GMT call time
Best time for a conference call or a meeting is between 10am-5pm10:00-17:00 in Porto which corresponds to 9am-4pm09:00-16:00 in GMT
1:00 pm13:00 WEST (Western European Summer Time) (Porto, Portugal). Offset UTC +1:00 hour
12:00 pm12:00 Greenwich Mean Time (GMT). Offset UTC 0:00 hours
1:00 pm13:00 Porto, Portugal / 12:00 pm12:00 GMT
Choose an hour to update the converter. Day labels such as “next day” or “+1” are relative to the selected date in the first column. Use Up and Down arrow keys, Home or End to move between hours, then Enter or Space to select.
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Porto Time Zone and Facts
Time Zone
WET – Western European Time, UTC+0 (standard time)
Porto Facts
Greenwich Mean Time
Offset: GMT is the same as Greenwich Mean Time (GMT).
Countries using this time zone: Burkina Faso, Côte d'Ivoire, Britain (UK), Guernsey, Ghana, Greenland, Gambia, Guinea, Guinea-Bissau, Ireland, Isle of Man, Iceland, Jersey, Liberia, Mali, Mauritania, St Helena, Sierra Leone, Senegal, Sao Tome & Principe, Togo
Principal Cities: The largest city in the GMT time zone is London in the United Kingdom, with about 8.962 million people. Other major cities in this time zone include Abidjan, Bamako, Dakar, Kumasi.
Greenwich Mean Time (GMT) originally referred to the mean solar time at the Royal Observatory in Greenwich, London. It is now often used to refer to Coordinated Universal Time (UTC) when this is viewed as a time zone, and in casual use the two are the same. In the military, GMT is known as Zulu time. Greenwich Mean Time was the same as Universal Time (UT), a standard astronomical concept used in many technical fields, until the introduction of UTC in 1972.
Today the lighter areas are on UTC+1 (British Summer Time, Irish Standard Time).
GMT representations, usage and related time zones
- Z - is the zone designator for the zero UTC/GMT offset, also known as 'Zulu' time
- +00 - basic short
- +0000 - basic
- +00:00 - extended
- +0000 - sign character (+) followed by a four digit time providing hours (00) and minutes (00) of the offset. Indicates the zero UTC/GMT offset.
- Zulu - Military abbreviation for GMT
- Z - short form of 'Zulu'
- Africa/Abidjan
- Africa/Accra
- Africa/Bamako
- Africa/Banjul
- Africa/Bissau
- Africa/Conakry
- Africa/Dakar
- Africa/Freetown
- Africa/Lome
- Africa/Monrovia
- Africa/Nouakchott
- Africa/Ouagadougou
- Africa/Sao_Tome
- Africa/Timbuktu
- America/Danmarkshavn
- Atlantic/Reykjavik
- Atlantic/St_Helena
- Eire
- Etc/GMT
- Etc/GMT+0
- Etc/GMT-0
- Etc/GMT0
- Etc/Greenwich
- Europe/Belfast
- Europe/Dublin
- Europe/Guernsey
- Europe/Isle_of_Man
- Europe/Jersey
- Europe/London
- GB
- GB-Eire
- GMT
- GMT+0
- GMT-0
- GMT0
- Greenwich
- Iceland
- EGST - Eastern Greenland Summer Time
- GMT - Greenwich Mean Time
- WET - Western European Time
- AZOST - Azores Summer Time
- UTC - Coordinated Universal Time
- WT - Western Sahara Standard Time
- Z - Zulu Time Zone