GMT to CKT Time Converter

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

London · Greenwich Mean Time
14:58:20
Wednesday, May 13, 2026
GMT+1 · UTC+01:00
Rarotonga · Cook Islands Time
03:58:20
Wednesday, May 13, 2026
GMT-10 · UTC-10:00

Convert a specific time

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

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
CKT (Cook Islands Time)
Observes DST
No

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 GMT and CKT 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
CKT
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 CKT.
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 CKT conversion table

GMT time (London)CKT time (Rarotonga)Status
00:00 Wed13:00 TueCKT working
01:00 Wed14:00 TueCKT working
02:00 Wed15:00 TueCKT working
03:00 Wed16:00 TueCKT working
04:00 Wed17:00 TueOff-hours both sides
05:00 Wed18:00 TueOff-hours both sides
06:00 Wed19:00 TueOff-hours both sides
07:00 Wed20:00 TueOff-hours both sides
08:00 Wed21:00 TueOff-hours both sides
09:00 Wed22:00 TueGMT working
10:00 Wed23:00 TueGMT working
11:00 Wed00:00 WedGMT working
12:00 Wed01:00 WedGMT working
13:00 Wed02:00 WedGMT working
14:00 Wed03:00 WedGMT working
15:00 Wed04:00 WedGMT working
16:00 Wed05:00 WedGMT working
17:00 Wed06:00 WedOff-hours both sides
18:00 Wed07:00 WedOff-hours both sides
19:00 Wed08:00 WedOff-hours both sides
20:00 Wed09:00 WedCKT working
21:00 Wed10:00 WedCKT working
22:00 Wed11:00 WedCKT working
23:00 Wed12:00 WedCKT 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
Cook Islands Time (CKT)
IANA identifier
Pacific/Rarotonga
Current UTC offset
UTC-10:00
Current abbreviation
GMT-10
Major cities in this zone
Rarotonga

Sun today in London and Rarotonga

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

Related converters

CKT to GMT (reverse)GMT to ESTGMT to PSTGMT to UTCGMT to CETGMT to ISTEST to CKTPST to CKTUTC to CKTCET to CKTIST to CKT
Looking for local time? See time in London or time in Rarotonga.

Frequently asked questions

What is the time difference between GMT and CKT right now?+
CKT (Cook Islands Time) is currently 11 hours behind 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 CKT observe daylight saving time?+
GMT: observes daylight saving time. CKT: does not observe daylight saving time.
When is the best time to schedule a meeting between GMT and CKT?+
GMT and CKT 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 Rarotonga when it is 12:00 noon in London?+
When it is 12:00 Wed in London (GMT), it is 01:00 Wed in Rarotonga (CKT).
Which IANA time zone identifiers are used for GMT and CKT?+
GMT maps to "Europe/London" in the IANA database. CKT maps to "Pacific/Rarotonga". These identifiers are what most software libraries use to convert times accurately, including DST handling.
Is London ahead of or behind Rarotonga?+
Whether London (GMT) is ahead of or behind Rarotonga (CKT) depends on the current UTC offsets. Right now CKT is 11 hours behind GMT. The live converter and side-by-side clocks above always reflect the current direction.
What are the current UTC offsets for GMT and CKT?+
GMT is UTC+01:00 (GMT+1) and CKT is UTC-10:00 (GMT-10). 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 CKT?+
No standard business-hours overlap exists between GMT and CKT. Plan asynchronous work or schedule outside 9-5 on at least one side.