Greenwich Mean Time
GMT means UTC throughout the year.
TIME ZONE CONVERTER
GMT to Lisbon
Time Converter
Convert Greenwich Mean Time to Lisbon, Portugal. Compare dates, seasonal differences and meeting hours.
GMT is 0h or 1h behind Lisbon in 2026, depending on the date.
9 AM GMT = 9 AM Lisbon
Selected date: November 10, 2026. Fixed abbreviations retain their stated UTC offsets.
THE QUICK REFERENCE
CSVGMT to Lisbon conversion table
November 10, 2026 · Date changes are marked.
View the full 24-hour table
| GMT | Lisbon |
|---|---|
| 12:00 AM | 12:00 AM |
| 1:00 AM | 1:00 AM |
| 2:00 AM | 2:00 AM |
| 3:00 AM | 3:00 AM |
| 4:00 AM | 4:00 AM |
| 5:00 AM | 5:00 AM |
| 6:00 AM | 6:00 AM |
| 7:00 AM | 7:00 AM |
| 8:00 AM | 8:00 AM |
| 9:00 AM | 9:00 AM |
| 10:00 AM | 10:00 AM |
| 11:00 AM | 11:00 AM |
| GMT | Lisbon |
|---|---|
| 12:00 PM | 12:00 PM |
| 1:00 PM | 1:00 PM |
| 2:00 PM | 2:00 PM |
| 3:00 PM | 3:00 PM |
| 4:00 PM | 4:00 PM |
| 5:00 PM | 5:00 PM |
| 6:00 PM | 6:00 PM |
| 7:00 PM | 7:00 PM |
| 8:00 PM | 8:00 PM |
| 9:00 PM | 9:00 PM |
| 10:00 PM | 10:00 PM |
| 11:00 PM | 11:00 PM |
Starting with the Lisbon working day
These examples start on 2026-11-10 in Lisbon.
09:00 Lisbon09:00 →GMT · 2026-11-10
17:00 Lisbon17:00 →GMT · 2026-11-10
Which time-zone meaning are we using?
ONE CLOCK TIME. THE WHOLE YEAR.
Year CSV09:00 GMT to Lisbon throughout 2026
Keeping 09:00 on the GMT clock produces 2 different destination clock/date answers in 2026. The ranges below use GMT calendar dates, including transition days.
| Dates in GMT · 2026 | Lisbon answer | Source → destination offsets | Explore |
|---|---|---|---|
| Jan 1 – Mar 2887 dates | 09:00Same date | UTC → UTC | |
| Mar 29 – Oct 24210 dates | 10:00Same date | UTC → UTC+01:00 | |
| Oct 25 – Dec 3168 dates | 09:00Same date | UTC → UTC |
Every calendar date is included, not just workdays. Date ranges include both endpoints. Based on IANA 2026e; future rules may change.
DON’T LOSE A DAY
When does GMT time become a different date in Lisbon?
Your complete source day: 2026-11-10. Each range shows which destination date to use.
GMT · 2026-11-1000:00–24:00UTC
Lisbon · 2026-11-1000:00–24:00UTC Same date
Range starts are included; ends are excluded. 24:00 means midnight at the end of that date. Repeated hours appear separately with their UTC offsets. The strip is proportional to elapsed time.
THE BIGGER PICTURE
2026A year of time differences.
How Lisbon compares with GMT throughout 2026.
JANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDEC
0h
+1h
0h
Lisbon changes its UTC offset in 2026. GMT is a fixed offset.
See exact change periods
| From (UTC, inclusive) | Until (UTC, exclusive) | Lisbon vs GMT |
|---|---|---|
| 1 Jan 2026, 00:00 UTC | 29 Mar 2026, 01:00 UTC | 0h difference |
| 29 Mar 2026, 01:00 UTC | 25 Oct 2026, 01:00 UTC | 1h ahead |
| 25 Oct 2026, 01:00 UTC | 1 Jan 2027, 00:00 UTC | 0h difference |
CLOCK CHANGES
What changes at the next clock adjustment?
Exact periods outside the most common difference in 2026
The most frequent difference has Lisbon 1h ahead relative to GMT. Exceptions:
| From (UTC, inclusive) | Until (UTC, exclusive) | Compared with GMT |
|---|---|---|
| 1 Jan 2026, 00:00 UTC | 29 Mar 2026, 01:00 UTC | the same time |
| 25 Oct 2026, 01:00 UTC | 1 Jan 2027, 00:00 UTC | the same time |
PLAN BEYOND A SINGLE DAY
Daily CSVGMT–Lisbon working hours through 2026
Every date calculated with your working windows. 261 selected GMT workdays; public holidays are not applied.
Least shared time7h
Most common7h
Most shared time8h
Days without a 60-min slot0 / 261
A start time that survives the whole year.
Start a 60-minute meeting in GMT 09:00–15:00.
These starts fit both working windows on every selected GMT workday in 2026, using a 15-minute start grid. The end of each range is the last valid start.
GMT: 09:00–17:00, Mon, Tue, Wed, Thu, Fri. Lisbon: 09:00–17:00, Mon, Tue, Wed, Thu, Fri.
Calculation details and repeated hours
Overnight shifts belong to their start weekday. Host workday means the source calendar date. Repeated local times use the first occurrence.
THE DETAILS THAT MATTER
GMT to Lisbon: useful answers
Why is the GMT to Lisbon difference sometimes 0 hours and sometimes 1 hour?
GMT is 0h or 1h behind Lisbon in 2026, depending on the date. Lisbon changes its UTC offset in 2026. GMT is a fixed offset.
Does the GMT–Lisbon time difference change in 2026?
The published rules produce 3 periods with 2 different offsets in 2026. See the annual chart for the exact boundaries of each period.
Does this conversion change the calendar date?
09:00 in GMT on 2026-11-10 is 09:00 in Lisbon on 2026-11-10. This selected time stays on the same date in both places. Other times can cross midnight.
Can GMT and Lisbon meet during working hours?
Your selected working windows share 8h on 2026-11-10. The planner above checks the whole meeting duration and shows suitable start times. Edit the windows to match your team.
Calculated with IANA 2026e. Working hours are your preferences; public holidays and calendar availability are not included. Our methodology