TOT to GMT Time Converter

Convert Tonga Time (TOT) to Greenwich Mean Time (GMT). Both time zones are shown live below; current offset between them is 12 hours behind.

Nukualofa · Tonga Time
01:58:42
Thursday, May 14, 2026
GMT+13 · UTC+13:00
London · Greenwich Mean Time
13:58:42
Wednesday, May 13, 2026
GMT+1 · UTC+01:00

Convert a specific time

From: TOT (Nukualofa)
To: GMT (London)
--:--

Daylight Saving status right now

TOT (Tonga Time)
Observes DST
No
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

Heads up: GMT observes DST while TOT does not. The 12-hour difference shown above will shift by one hour when GMT starts or ends DST.

When can TOT and GMT meet?

00
01
02
03
04
05
06
07
08
09
10
11
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13
14
15
16
17
18
19
20
21
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23
TOT
GMT
Both zones in working hours (9am-5pm)
One zone working
Off-hours
Columns are hours of the day in Nukualofa (TOT). Each row shows the local working-hours state in that zone for the same moment in time.
No business-hours overlap exists between TOT and GMT.
The two zones are too far apart for synchronous meetings during normal working hours. Plan async or schedule outside 9-5 on at least one side.

Hour-by-hour TOT to GMT conversion table

TOT time (Nukualofa)GMT time (London)Status
00:00 Thu12:00 WedGMT working
01:00 Thu13:00 WedGMT working
02:00 Thu14:00 WedGMT working
03:00 Thu15:00 WedGMT working
04:00 Thu16:00 WedGMT working
05:00 Thu17:00 WedOff-hours both sides
06:00 Thu18:00 WedOff-hours both sides
07:00 Thu19:00 WedOff-hours both sides
08:00 Thu20:00 WedOff-hours both sides
09:00 Thu21:00 WedTOT working
10:00 Thu22:00 WedTOT working
11:00 Thu23:00 WedTOT working
12:00 Thu00:00 ThuTOT working
13:00 Thu01:00 ThuTOT working
14:00 Thu02:00 ThuTOT working
15:00 Thu03:00 ThuTOT working
16:00 Thu04:00 ThuTOT working
17:00 Thu05:00 ThuOff-hours both sides
18:00 Thu06:00 ThuOff-hours both sides
19:00 Thu07:00 ThuOff-hours both sides
20:00 Thu08:00 ThuOff-hours both sides
21:00 Thu09:00 ThuGMT working
22:00 Thu10:00 ThuGMT working
23:00 Thu11:00 ThuGMT working

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

Tonga Time (TOT)
IANA identifier
Pacific/Tongatapu
Current UTC offset
UTC+13:00
Current abbreviation
GMT+13
Major cities in this zone
Nuku'alofa
Greenwich Mean Time (GMT)
IANA identifier
Europe/London
Current UTC offset
UTC+01:00
Current abbreviation
GMT+1
Major cities in this zone
LondonManchesterEdinburghBirmingham

Sun today in Nukualofa and London

London
Sunrise
05:13
Sunset
20:43
Solar noon
12:58
Daylight
15h 29m

Related converters

GMT to TOT (reverse)TOT to ESTTOT to PSTTOT to UTCTOT to CETTOT to ISTEST to GMTPST to GMTUTC to GMTCET to GMTIST to GMT
Looking for local time? See time in Nuku'alofa or time in London.

Frequently asked questions

What is the time difference between TOT and GMT right now?+
GMT (Greenwich Mean Time) is currently 12 hours behind TOT (Tonga Time). The exact difference can change when one or both zones transition into or out of daylight saving time.
Does TOT or GMT observe daylight saving time?+
TOT: does not observe daylight saving time. GMT: observes daylight saving time.
When is the best time to schedule a meeting between TOT and GMT?+
TOT and GMT have no business-hour overlap, even at the edges of a typical workday. Async collaboration or non-9-5 scheduling is the practical choice.
What time is it in London when it is 12:00 noon in Nukualofa?+
When it is 12:00 Thu in Nukualofa (TOT), it is 00:00 Thu in London (GMT).
Which IANA time zone identifiers are used for TOT and GMT?+
TOT maps to "Pacific/Tongatapu" in the IANA database. GMT maps to "Europe/London". These identifiers are what most software libraries use to convert times accurately, including DST handling.
Is Nukualofa ahead of or behind London?+
Whether Nukualofa (TOT) is ahead of or behind London (GMT) depends on the current UTC offsets. Right now GMT is 12 hours behind TOT. The live converter and side-by-side clocks above always reflect the current direction.
What are the current UTC offsets for TOT and GMT?+
TOT is UTC+13:00 (GMT+13) and GMT 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 TOT and GMT?+
No standard business-hours overlap exists between TOT and GMT. Plan asynchronous work or schedule outside 9-5 on at least one side.