GMT to WEST: GMT is 1 hour behind WEST
Greenwich Mean Time is 1 hour behind Western European Time right now. It is 4:35 am GMT in GMT and 5:35 am WEST in Lisbon.
Convert a specific time from GMT to WEST
Pick any time and date to convert it both ways. The conversion runs in your browser against the real zone rules, so a date inside a daylight saving period gets that period's offset rather than today's.
What is the time difference between GMT and WEST?
Western European Time is 1 hour ahead of Greenwich Mean Time. To go from GMT to WEST you add 1 hour. That gap is not fixed. Across 2026 the distance between these two zones takes 2 different values, from no difference to 1 hour, because Lisbon moves its clocks and GMT does not. This page recomputes it rather than assuming.
GMT to WEST conversion table
Every hour of Sunday, September 27, 2026 in GMT, with the matching reading in Lisbon. 1 of the 24 hours land on a different calendar date in Lisbon, which is the part people get wrong when they schedule across this pair.
| GMT | GMT 24h | WEST | WEST 24h | Date |
|---|---|---|---|---|
| 12:00 am | 00:00 | 1:00 am | 01:00 | same day |
| 1:00 am | 01:00 | 2:00 am | 02:00 | same day |
| 2:00 am | 02:00 | 3:00 am | 03:00 | same day |
| 3:00 am | 03:00 | 4:00 am | 04:00 | same day |
| 4:00 am | 04:00 | 5:00 am | 05:00 | same day |
| 5:00 am | 05:00 | 6:00 am | 06:00 | same day |
| 6:00 am | 06:00 | 7:00 am | 07:00 | same day |
| 7:00 am | 07:00 | 8:00 am | 08:00 | same day |
| 8:00 am | 08:00 | 9:00 am | 09:00 | same day |
| 9:00 am | 09:00 | 10:00 am | 10:00 | same day |
| 10:00 am | 10:00 | 11:00 am | 11:00 | same day |
| 11:00 am | 11:00 | 12:00 pm | 12:00 | same day |
| 12:00 pm | 12:00 | 1:00 pm | 13:00 | same day |
| 1:00 pm | 13:00 | 2:00 pm | 14:00 | same day |
| 2:00 pm | 14:00 | 3:00 pm | 15:00 | same day |
| 3:00 pm | 15:00 | 4:00 pm | 16:00 | same day |
| 4:00 pm | 16:00 | 5:00 pm | 17:00 | same day |
| 5:00 pm | 17:00 | 6:00 pm | 18:00 | same day |
| 6:00 pm | 18:00 | 7:00 pm | 19:00 | same day |
| 7:00 pm | 19:00 | 8:00 pm | 20:00 | same day |
| 8:00 pm | 20:00 | 9:00 pm | 21:00 | same day |
| 9:00 pm | 21:00 | 10:00 pm | 22:00 | same day |
| 10:00 pm | 22:00 | 11:00 pm | 23:00 | same day |
| 11:00 pm | 23:00 | 12:00 am | 00:00 | the next day |
What are the best hours to schedule a call between GMT and WEST?
7 hours of the standard 9:00 am to 5:00 pm working day line up in both zones, from 9:00 am GMT to 4:00 pm GMT. In Lisbon that window reads 10:00 am to 5:00 pm. Outside it, one side is either not yet at their desk or already gone.
| GMT | WEST | Working hours | Note |
|---|---|---|---|
| 9:00 am | 10:00 am | both sides | mid morning in GMT, mid morning in Lisbon |
| 10:00 am | 11:00 am | both sides | mid morning in GMT, mid morning in Lisbon |
| 11:00 am | 12:00 pm | both sides | mid morning in GMT, noon in Lisbon |
| 12:00 pm | 1:00 pm | both sides | noon in GMT, afternoon in Lisbon |
| 1:00 pm | 2:00 pm | both sides | afternoon in GMT, afternoon in Lisbon |
| 2:00 pm | 3:00 pm | both sides | afternoon in GMT, afternoon in Lisbon |
| 3:00 pm | 4:00 pm | both sides | afternoon in GMT, afternoon in Lisbon |
Does daylight saving change GMT to WEST?
Greenwich Mean Time does not move its clocks at all, so its UTC+0 offset holds every day of the year.
Western European Time is currently on WEST and changes next on Sunday, October 25, 2026, when the clock falls back from 1:59 am to 1:00 am and the offset moves from UTC+1 to UTC+0.
Because the two sides do not move together, the answer to this conversion changes during the year. For part of the year the gap is no difference and for the rest it is 1 hour. The table above is built for today, not for an average day.
Is GMT ahead of or behind WEST?
GMT is behind WEST by 1 hour: when it is 12:00 pm in GMT, it is 1:00 pm in Lisbon. One wrinkle worth knowing: WET and WEST are two names for the same zone, not two zones. Western European Time reads WET in winter and WEST in summer. When somebody types "gmt to wet" they nearly always mean the zone rather than the literal winter offset, so this page resolves GMT to Etc/GMT and WET to Europe/Lisbon and applies whichever offset is genuinely in force on the day.
Greenwich Mean Time covers identical to UTC as a clock reading, and a separate thing as a standard. Western European Time covers Lisbon, Porto and the Canary Islands, one hour behind most of the continent. The identifiers behind them are Etc/GMT and Europe/Lisbon, which is what any calendar or scheduling system should be storing rather than a fixed number of hours.
Questions
- What is GMT in WEST?
- GMT is 1 hour behind WEST. 9:00 am GMT is 10:00 am WEST.
- How many hours ahead is WEST of GMT?
- WEST is 1 hour ahead of GMT. That varies across the year, between no difference and 1 hour.
- What time is it in Lisbon right now?
- 5:35 am WEST on Sunday, September 27, 2026.
- When can GMT and Lisbon meet during working hours?
- Between 9:00 am and 4:00 pm GMT, which is 10:00 am to 5:00 pm WEST.
- Does this account for daylight saving?
- Yes. Every reading is computed from the IANA database for the actual date, so GMT and WEST are the abbreviations genuinely in force today rather than a fixed assumption.
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