GMT to WEST Time Converter

Convert Greenwich Mean Time (GMT) to Western European Summer Time (WEST). Both time zones are shown live below; current offset between them is same time.

London · Greenwich Mean Time
21:03:31
Tuesday, May 12, 2026
GMT+1 · UTC+01:00
Lisbon · Western European Summer Time
21:03:31
Tuesday, May 12, 2026
GMT+1 · UTC+01:00

Convert a specific time

From: GMT (London)
To: WEST (Lisbon)
--:--

Daylight Saving status right now

GMT (Greenwich Mean Time)
Observes DST
Yes
In DST right now
Yes
Next fall back
2026-10-25
Offset shift
UTC+01:00 → UTC+00:00
WEST (Western European Summer Time)
Observes DST
Yes
In DST right now
Yes
Next fall back
2026-10-25
Offset shift
UTC+01:00 → UTC+00:00

When can GMT and WEST meet?

00
01
02
03
04
05
06
07
08
09
10
11
12
13
14
15
16
17
18
19
20
21
22
23
GMT
WEST
Both zones in working hours (9am-5pm)
One zone working
Off-hours
Columns are hours of the day in London (GMT). Each row shows the local working-hours state in that zone for the same moment in time.
8 hours of overlap during standard 9am-5pm working hours.
Best meeting window: 09:00–16:00 GMT (09:00–16:00 WEST).

Hour-by-hour GMT to WEST conversion table

GMT time (London)WEST time (Lisbon)Status
00:00 Tue00:00 TueOff-hours both sides
01:00 Tue01:00 TueOff-hours both sides
02:00 Tue02:00 TueOff-hours both sides
03:00 Tue03:00 TueOff-hours both sides
04:00 Tue04:00 TueOff-hours both sides
05:00 Tue05:00 TueOff-hours both sides
06:00 Tue06:00 TueOff-hours both sides
07:00 Tue07:00 TueOff-hours both sides
08:00 Tue08:00 TueOff-hours both sides
09:00 Tue09:00 TueBoth at work
10:00 Tue10:00 TueBoth at work
11:00 Tue11:00 TueBoth at work
12:00 Tue12:00 TueBoth at work
13:00 Tue13:00 TueBoth at work
14:00 Tue14:00 TueBoth at work
15:00 Tue15:00 TueBoth at work
16:00 Tue16:00 TueBoth at work
17:00 Tue17:00 TueOff-hours both sides
18:00 Tue18:00 TueOff-hours both sides
19:00 Tue19:00 TueOff-hours both sides
20:00 Tue20:00 TueOff-hours both sides
21:00 Tue21:00 TueOff-hours both sides
22:00 Tue22:00 TueOff-hours both sides
23:00 Tue23:00 TueOff-hours both sides

Times computed for today in each zone using the IANA time zone database. The conversion accounts for daylight saving time wherever applicable.

About these time zones

Greenwich Mean Time (GMT)
IANA identifier
Europe/London
Current UTC offset
UTC+01:00
Current abbreviation
GMT+1
Major cities in this zone
LondonManchesterEdinburghBirmingham
Western European Summer Time (WEST)
IANA identifier
Europe/Lisbon
Current UTC offset
UTC+01:00
Current abbreviation
GMT+1
Major cities in this zone
Lisbon

Sun today in London and Lisbon

London
Sunrise
05:14
Sunset
20:41
Solar noon
12:58
Daylight
15h 26m

Related converters

WEST to GMT (reverse)GMT to ESTGMT to PSTGMT to UTCGMT to CETGMT to ISTEST to WESTPST to WESTUTC to WESTCET to WESTIST to WEST
Looking for local time? See time in London or time in Lisbon.

Frequently asked questions

What is the time difference between GMT and WEST right now?+
WEST (Western European Summer Time) is currently same time GMT (Greenwich Mean Time). The exact difference can change when one or both zones transition into or out of daylight saving time.
Does GMT or WEST observe daylight saving time?+
GMT: observes daylight saving time. WEST: observes daylight saving time.
When is the best time to schedule a meeting between GMT and WEST?+
The strongest overlap is 09:00–16:00 GMT (09:00–16:00 WEST), giving 8 hours when both sides are within standard 9am-5pm working hours.
What time is it in Lisbon when it is 12:00 noon in London?+
When it is 12:00 Tue in London (GMT), it is 12:00 Tue in Lisbon (WEST).
Which IANA time zone identifiers are used for GMT and WEST?+
GMT maps to "Europe/London" in the IANA database. WEST maps to "Europe/Lisbon". These identifiers are what most software libraries use to convert times accurately, including DST handling.
Is London ahead of or behind Lisbon?+
Whether London (GMT) is ahead of or behind Lisbon (WEST) depends on the current UTC offsets. Right now WEST is same time GMT. The live converter and side-by-side clocks above always reflect the current direction.
What are the current UTC offsets for GMT and WEST?+
GMT is UTC+01:00 (GMT+1) and WEST is UTC+01:00 (GMT+1). Both offsets shift by one hour when the corresponding region enters or exits daylight saving time, so the live values on this page are the source of truth.
Can I schedule meetings during business hours for both GMT and WEST?+
Yes. There are 8 hours of overlap during standard 9am-5pm working hours, with the strongest window at 09:00–16:00 GMT.