CHST to GMT Time Converter

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

Hagåtña · Chamorro Standard Time
16:25:18
Saturday, May 16, 2026
GMT+10 · UTC+10:00
London · Greenwich Mean Time
07:25:18
Saturday, May 16, 2026
GMT+1 · UTC+01:00

Convert a specific time

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

Daylight Saving status right now

CHST (Chamorro Standard 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 CHST does not. The 9-hour difference shown above will shift by one hour when GMT starts or ends DST.

When can CHST 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
CHST
GMT
Both zones in working hours (9am-5pm)
One zone working
Off-hours
Columns are hours of the day in Hagåtña (CHST). 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 17:00–18:00 CHST (08:00–09:00 GMT).

Hour-by-hour CHST to GMT conversion table

CHST time (Hagåtña)GMT time (London)Status
00:00 Sat15:00 FriGMT working
01:00 Sat16:00 FriGMT working
02:00 Sat17:00 FriOff-hours both sides
03:00 Sat18:00 FriOff-hours both sides
04:00 Sat19:00 FriOff-hours both sides
05:00 Sat20:00 FriOff-hours both sides
06:00 Sat21:00 FriOff-hours both sides
07:00 Sat22:00 FriOff-hours both sides
08:00 Sat23:00 FriOff-hours both sides
09:00 Sat00:00 SatCHST working
10:00 Sat01:00 SatCHST working
11:00 Sat02:00 SatCHST working
12:00 Sat03:00 SatCHST working
13:00 Sat04:00 SatCHST working
14:00 Sat05:00 SatCHST working
15:00 Sat06:00 SatCHST working
16:00 Sat07:00 SatCHST working
17:00 Sat08:00 SatOff-hours both sides
18:00 Sat09:00 SatGMT working
19:00 Sat10:00 SatGMT working
20:00 Sat11:00 SatGMT working
21:00 Sat12:00 SatGMT working
22:00 Sat13:00 SatGMT working
23:00 Sat14:00 SatGMT 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

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

London
Sunrise
05:08
Sunset
20:47
Solar noon
12:58
Daylight
15h 38m

Related converters

GMT to CHST (reverse)CHST to ESTCHST to PSTCHST to UTCCHST to CETCHST to ISTEST to GMTPST to GMTUTC to GMTCET to GMTIST to GMT
Looking for local time? See time in Hagåtña or time in London.

Frequently asked questions

What is the time difference between CHST and GMT right now?+
GMT (Greenwich Mean Time) is currently 9 hours behind CHST (Chamorro Standard Time). The exact difference can change when one or both zones transition into or out of daylight saving time.
Does CHST or GMT observe daylight saving time?+
CHST: does not observe daylight saving time. GMT: observes daylight saving time.
When is the best time to schedule a meeting between CHST and GMT?+
Standard 9-5 hours do not overlap. Extending to 8am-7pm gives a window of 17:00–18:00 CHST (08:00–09:00 GMT).
What time is it in London when it is 12:00 noon in Hagåtña?+
When it is 12:00 Sat in Hagåtña (CHST), it is 03:00 Sat in London (GMT).
Which IANA time zone identifiers are used for CHST and GMT?+
CHST maps to "Pacific/Guam" 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 Hagåtña ahead of or behind London?+
Whether Hagåtña (CHST) is ahead of or behind London (GMT) depends on the current UTC offsets. Right now GMT is 9 hours behind CHST. The live converter and side-by-side clocks above always reflect the current direction.
What are the current UTC offsets for CHST and GMT?+
CHST 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 CHST and GMT?+
Not during a strict 9am-5pm window. If both sides flex to 8am-7pm, the available meeting window between CHST and GMT is 17:00–18:00 CHST.