GMT to TOT Time Converter

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

London · Greenwich Mean Time
08:04:20
Tuesday, May 12, 2026
GMT+1 · UTC+01:00
Nukualofa · Tonga Time
20:04:20
Tuesday, May 12, 2026
GMT+13 · UTC+13:00

Convert a specific time

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

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
TOT (Tonga Time)
Observes DST
No

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 GMT and TOT 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
TOT
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.
No business-hours overlap exists between GMT and TOT.
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 GMT to TOT conversion table

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

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

Sun today in London and Nukualofa

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

Related converters

TOT to GMT (reverse)GMT to ESTGMT to PSTGMT to UTCGMT to CETGMT to ISTEST to TOTPST to TOTUTC to TOTCET to TOTIST to TOT
Looking for local time? See time in London or time in Nuku'alofa.

Frequently asked questions

What is the time difference between GMT and TOT right now?+
TOT (Tonga Time) is currently 12 hours ahead 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 TOT observe daylight saving time?+
GMT: observes daylight saving time. TOT: does not observe daylight saving time.
When is the best time to schedule a meeting between GMT and TOT?+
GMT and TOT 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 Nukualofa when it is 12:00 noon in London?+
When it is 12:00 Tue in London (GMT), it is 00:00 Wed in Nukualofa (TOT).
Which IANA time zone identifiers are used for GMT and TOT?+
GMT maps to "Europe/London" in the IANA database. TOT maps to "Pacific/Tongatapu". These identifiers are what most software libraries use to convert times accurately, including DST handling.
Is London ahead of or behind Nukualofa?+
Whether London (GMT) is ahead of or behind Nukualofa (TOT) depends on the current UTC offsets. Right now TOT is 12 hours ahead GMT. The live converter and side-by-side clocks above always reflect the current direction.
What are the current UTC offsets for GMT and TOT?+
GMT is UTC+01:00 (GMT+1) and TOT is UTC+13:00 (GMT+13). 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 TOT?+
No standard business-hours overlap exists between GMT and TOT. Plan asynchronous work or schedule outside 9-5 on at least one side.