CHAST to GMT Time Converter

Convert Chatham Standard Time (CHAST) to Greenwich Mean Time (GMT). Both time zones are shown live below; current offset between them is 11h 45m behind.

Chatham Islands · Chatham Standard Time
03:51:49
Wednesday, May 13, 2026
GMT+12:45 · UTC+12:45
London · Greenwich Mean Time
16:06:49
Tuesday, May 12, 2026
GMT+1 · UTC+01:00

Convert a specific time

From: CHAST (Chatham Islands)
To: GMT (London)
--:--

Daylight Saving status right now

CHAST (Chatham Standard Time)
Observes DST
Yes
In DST right now
No
Next spring forward
2026-09-27
Offset shift
UTC+12:45 → UTC+13:45
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

When can CHAST and GMT 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
CHAST
GMT
Both zones in working hours (9am-5pm)
One zone working
Off-hours
Columns are hours of the day in Chatham Islands (CHAST). Each row shows the local working-hours state in that zone for the same moment in time.
No business-hours overlap exists between CHAST 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 CHAST to GMT conversion table

CHAST time (Chatham Islands)GMT time (London)Status
00:00 Wed12:15 TueGMT working
01:00 Wed13:15 TueGMT working
02:00 Wed14:15 TueGMT working
03:00 Wed15:15 TueGMT working
04:00 Wed16:15 TueGMT working
05:00 Wed17:15 TueOff-hours both sides
06:00 Wed18:15 TueOff-hours both sides
07:00 Wed19:15 TueOff-hours both sides
08:00 Wed20:15 TueOff-hours both sides
09:00 Wed21:15 TueCHAST working
10:00 Wed22:15 TueCHAST working
11:00 Wed23:15 TueCHAST working
12:00 Wed00:15 WedCHAST working
13:00 Wed01:15 WedCHAST working
14:00 Wed02:15 WedCHAST working
15:00 Wed03:15 WedCHAST working
16:00 Wed04:15 WedCHAST working
17:00 Wed05:15 WedOff-hours both sides
18:00 Wed06:15 WedOff-hours both sides
19:00 Wed07:15 WedOff-hours both sides
20:00 Wed08:15 WedOff-hours both sides
21:00 Wed09:15 WedGMT working
22:00 Wed10:15 WedGMT working
23:00 Wed11:15 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

Chatham Standard Time (CHAST)
IANA identifier
Pacific/Chatham
Current UTC offset
UTC+12:45
Current abbreviation
GMT+12:45
Major cities in this zone
Chatham Islands
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 Chatham Islands and London

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

Related converters

GMT to CHAST (reverse)CHAST to ESTCHAST to PSTCHAST to UTCCHAST to CETCHAST to ISTEST to GMTPST to GMTUTC to GMTCET to GMTIST to GMT
Looking for local time? See time in Chatham Islands or time in London.

Frequently asked questions

What is the time difference between CHAST and GMT right now?+
GMT (Greenwich Mean Time) is currently 11h 45m behind CHAST (Chatham Standard Time). The exact difference can change when one or both zones transition into or out of daylight saving time.
Does CHAST or GMT observe daylight saving time?+
CHAST: observes daylight saving time. GMT: observes daylight saving time.
When is the best time to schedule a meeting between CHAST and GMT?+
CHAST 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 Chatham Islands?+
When it is 12:00 Wed in Chatham Islands (CHAST), it is 00:15 Wed in London (GMT).
Which IANA time zone identifiers are used for CHAST and GMT?+
CHAST maps to "Pacific/Chatham" 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 Chatham Islands ahead of or behind London?+
Whether Chatham Islands (CHAST) is ahead of or behind London (GMT) depends on the current UTC offsets. Right now GMT is 11h 45m behind CHAST. The live converter and side-by-side clocks above always reflect the current direction.
What are the current UTC offsets for CHAST and GMT?+
CHAST is UTC+12:45 (GMT+12:45) 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 CHAST and GMT?+
No standard business-hours overlap exists between CHAST and GMT. Plan asynchronous work or schedule outside 9-5 on at least one side.