CKT to GMT Time Converter

Convert Cook Islands Time (CKT) to Greenwich Mean Time (GMT). Both time zones are shown live below; current offset between them is 11 hours ahead.

Rarotonga · Cook Islands Time
12:08:15
Tuesday, May 12, 2026
GMT-10 · UTC-10:00
London · Greenwich Mean Time
23:08:15
Tuesday, May 12, 2026
GMT+1 · UTC+01:00

Convert a specific time

From: CKT (Rarotonga)
To: GMT (London)
--:--

Daylight Saving status right now

CKT (Cook Islands 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 CKT does not. The 11-hour difference shown above will shift by one hour when GMT starts or ends DST.

When can CKT and GMT meet?

00
01
02
03
04
05
06
07
08
09
10
11
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13
14
15
16
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18
19
20
21
22
23
CKT
GMT
Both zones in working hours (9am-5pm)
One zone working
Off-hours
Columns are hours of the day in Rarotonga (CKT). Each row shows the local working-hours state in that zone for the same moment in time.
No business-hours overlap exists between CKT 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 CKT to GMT conversion table

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

Cook Islands Time (CKT)
IANA identifier
Pacific/Rarotonga
Current UTC offset
UTC-10:00
Current abbreviation
GMT-10
Major cities in this zone
Rarotonga
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 Rarotonga and London

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

Related converters

GMT to CKT (reverse)CKT to ESTCKT to PSTCKT to UTCCKT to CETCKT to ISTEST to GMTPST to GMTUTC to GMTCET to GMTIST to GMT
Looking for local time? See time in Rarotonga or time in London.

Frequently asked questions

What is the time difference between CKT and GMT right now?+
GMT (Greenwich Mean Time) is currently 11 hours ahead CKT (Cook Islands Time). The exact difference can change when one or both zones transition into or out of daylight saving time.
Does CKT or GMT observe daylight saving time?+
CKT: does not observe daylight saving time. GMT: observes daylight saving time.
When is the best time to schedule a meeting between CKT and GMT?+
CKT 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 Rarotonga?+
When it is 12:00 Tue in Rarotonga (CKT), it is 23:00 Tue in London (GMT).
Which IANA time zone identifiers are used for CKT and GMT?+
CKT maps to "Pacific/Rarotonga" 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 Rarotonga ahead of or behind London?+
Whether Rarotonga (CKT) is ahead of or behind London (GMT) depends on the current UTC offsets. Right now GMT is 11 hours ahead CKT. The live converter and side-by-side clocks above always reflect the current direction.
What are the current UTC offsets for CKT and GMT?+
CKT is UTC-10:00 (GMT-10) 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 CKT and GMT?+
No standard business-hours overlap exists between CKT and GMT. Plan asynchronous work or schedule outside 9-5 on at least one side.