GMT to CHST Time Converter

Convert Greenwich Mean Time (GMT) to Chamorro Standard Time (CHST). Both time zones are shown live below; current offset between them is 9 hours ahead.

London · Greenwich Mean Time
05:54:47
Thursday, May 14, 2026
GMT+1 · UTC+01:00
Hagåtña · Chamorro Standard Time
14:54:47
Thursday, May 14, 2026
GMT+10 · UTC+10:00

Convert a specific time

From: GMT (London)
To: CHST (Hagåtña)
--:--

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
CHST (Chamorro Standard Time)
Observes DST
No

Heads up: GMT observes DST while CHST does not. The 9-hour difference shown above will shift by one hour when GMT starts or ends DST.

When can GMT and CHST 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
CHST
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 overlap during strict 9-5 working hours; some flexibility needed.
If both sides are willing to extend to 8am-7pm, the available window is 08:00–09:00 GMT (17:00–18:00 CHST).

Hour-by-hour GMT to CHST conversion table

GMT time (London)CHST time (Hagåtña)Status
00:00 Thu09:00 ThuCHST working
01:00 Thu10:00 ThuCHST working
02:00 Thu11:00 ThuCHST working
03:00 Thu12:00 ThuCHST working
04:00 Thu13:00 ThuCHST working
05:00 Thu14:00 ThuCHST working
06:00 Thu15:00 ThuCHST working
07:00 Thu16:00 ThuCHST working
08:00 Thu17:00 ThuOff-hours both sides
09:00 Thu18:00 ThuGMT working
10:00 Thu19:00 ThuGMT working
11:00 Thu20:00 ThuGMT working
12:00 Thu21:00 ThuGMT working
13:00 Thu22:00 ThuGMT working
14:00 Thu23:00 ThuGMT working
15:00 Thu00:00 FriGMT working
16:00 Thu01:00 FriGMT working
17:00 Thu02:00 FriOff-hours both sides
18:00 Thu03:00 FriOff-hours both sides
19:00 Thu04:00 FriOff-hours both sides
20:00 Thu05:00 FriOff-hours both sides
21:00 Thu06:00 FriOff-hours both sides
22:00 Thu07:00 FriOff-hours both sides
23:00 Thu08:00 FriOff-hours both sides

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
Chamorro Standard Time (CHST)
IANA identifier
Pacific/Guam
Current UTC offset
UTC+10:00
Current abbreviation
GMT+10
Major cities in this zone
Hagåtña

Sun today in London and Hagåtña

London
Sunrise
05:11
Sunset
20:44
Solar noon
12:58
Daylight
15h 32m

Related converters

CHST to GMT (reverse)GMT to ESTGMT to PSTGMT to UTCGMT to CETGMT to ISTEST to CHSTPST to CHSTUTC to CHSTCET to CHSTIST to CHST
Looking for local time? See time in London or time in Hagåtña.

Frequently asked questions

What is the time difference between GMT and CHST right now?+
CHST (Chamorro Standard Time) is currently 9 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 CHST observe daylight saving time?+
GMT: observes daylight saving time. CHST: does not observe daylight saving time.
When is the best time to schedule a meeting between GMT and CHST?+
Standard 9-5 hours do not overlap. Extending to 8am-7pm gives a window of 08:00–09:00 GMT (17:00–18:00 CHST).
What time is it in Hagåtña when it is 12:00 noon in London?+
When it is 12:00 Thu in London (GMT), it is 21:00 Thu in Hagåtña (CHST).
Which IANA time zone identifiers are used for GMT and CHST?+
GMT maps to "Europe/London" in the IANA database. CHST maps to "Pacific/Guam". These identifiers are what most software libraries use to convert times accurately, including DST handling.
Is London ahead of or behind Hagåtña?+
Whether London (GMT) is ahead of or behind Hagåtña (CHST) depends on the current UTC offsets. Right now CHST is 9 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 CHST?+
GMT is UTC+01:00 (GMT+1) and CHST 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 CHST?+
Not during a strict 9am-5pm window. If both sides flex to 8am-7pm, the available meeting window between GMT and CHST is 08:00–09:00 GMT.