GMT to CHAST Time Converter

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

London · Greenwich Mean Time
07:02:32
Wednesday, May 13, 2026
GMT+1 · UTC+01:00
Chatham Islands · Chatham Standard Time
18:47:32
Wednesday, May 13, 2026
GMT+12:45 · UTC+12:45

Convert a specific time

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

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
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

When can GMT and CHAST 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
CHAST
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 CHAST.
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 CHAST conversion table

GMT time (London)CHAST time (Chatham Islands)Status
00:00 Wed11:45 WedCHAST working
01:00 Wed12:45 WedCHAST working
02:00 Wed13:45 WedCHAST working
03:00 Wed14:45 WedCHAST working
04:00 Wed15:45 WedCHAST working
05:00 Wed16:45 WedCHAST working
06:00 Wed17:45 WedOff-hours both sides
07:00 Wed18:45 WedOff-hours both sides
08:00 Wed19:45 WedOff-hours both sides
09:00 Wed20:45 WedGMT working
10:00 Wed21:45 WedGMT working
11:00 Wed22:45 WedGMT working
12:00 Wed23:45 WedGMT working
13:00 Wed00:45 ThuGMT working
14:00 Wed01:45 ThuGMT working
15:00 Wed02:45 ThuGMT working
16:00 Wed03:45 ThuGMT working
17:00 Wed04:45 ThuOff-hours both sides
18:00 Wed05:45 ThuOff-hours both sides
19:00 Wed06:45 ThuOff-hours both sides
20:00 Wed07:45 ThuOff-hours both sides
21:00 Wed08:45 ThuOff-hours both sides
22:00 Wed09:45 ThuCHAST working
23:00 Wed10:45 ThuCHAST 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
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

Sun today in London and Chatham Islands

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

Related converters

CHAST to GMT (reverse)GMT to ESTGMT to PSTGMT to UTCGMT to CETGMT to ISTEST to CHASTPST to CHASTUTC to CHASTCET to CHASTIST to CHAST
Looking for local time? See time in London or time in Chatham Islands.

Frequently asked questions

What is the time difference between GMT and CHAST right now?+
CHAST (Chatham Standard Time) is currently 11h 45m 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 CHAST observe daylight saving time?+
GMT: observes daylight saving time. CHAST: observes daylight saving time.
When is the best time to schedule a meeting between GMT and CHAST?+
GMT and CHAST 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 Chatham Islands when it is 12:00 noon in London?+
When it is 12:00 Wed in London (GMT), it is 23:45 Wed in Chatham Islands (CHAST).
Which IANA time zone identifiers are used for GMT and CHAST?+
GMT maps to "Europe/London" in the IANA database. CHAST maps to "Pacific/Chatham". These identifiers are what most software libraries use to convert times accurately, including DST handling.
Is London ahead of or behind Chatham Islands?+
Whether London (GMT) is ahead of or behind Chatham Islands (CHAST) depends on the current UTC offsets. Right now CHAST is 11h 45m 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 CHAST?+
GMT is UTC+01:00 (GMT+1) and CHAST is UTC+12:45 (GMT+12:45). 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 CHAST?+
No standard business-hours overlap exists between GMT and CHAST. Plan asynchronous work or schedule outside 9-5 on at least one side.