Current Time in Pacific/Guam Time Zone
IANA Name: Pacific/Guam
Standard Offset: UTC +10:00
Daylight Saving: No
Currently Observing DST: No ❌
Pacific/Guam Time Zone: Chamorro Standard Time (ChST)
The Pacific/Guam time zone is the official time for the U.S. territory of Guam in the western Pacific Ocean. It runs on Chamorro Standard Time (ChST), which is UTC+10:00 year-round with no daylight saving adjustments. This makes Guam one of the few places in the world that never changes its clocks.
Overview and Usage
Pacific/Guam applies exclusively to the island of Guam, a U.S. territory located in Micronesia. The zone is shared by the neighboring Northern Mariana Islands (Pacific/Saipan), which also uses ChST. The abbreviation ChST stands for Chamorro Standard Time, named after the indigenous Chamorro people. The offset is a constant UTC+10:00, meaning Guam is ten hours ahead of Coordinated Universal Time.
Daylight Saving Time: None
Guam does not observe daylight saving time. The territory lies near the equator (13°N latitude), so daylight hours vary little throughout the year. There is no practical benefit to shifting clocks. As a result, the offset remains UTC+10:00 every day of the year. This eliminates the biannual clock changes and provides a stable reference for scheduling.
Countries, Territories, and Cities
- Guam: The only territory using Pacific/Guam. Capital: Hagåtña. Largest city: Dededo.
- Other zones at UTC+10:00: Antarctica/DumontDUrville, Asia/Ust-Nera, Asia/Vladivostok, Australia/Brisbane, Australia/Lindeman, Pacific/Chuuk, Pacific/Port_Moresby, Pacific/Saipan.
While several other IANA zones share the same offset, they may observe daylight saving (e.g., Australia/Brisbane does not, but Asia/Vladivostok does). Always verify the specific zone when scheduling.
Business Hours and Call Scheduling
Guam's business day typically runs from 8:00 AM to 5:00 PM ChST. Key overlap windows with major regions:
- East Coast USA (UTC-5:00): When New York is on standard time, Guam is 15 hours ahead. Overlap: 8:00 AM ChST = 5:00 PM EST (previous day). Best for calls: early morning Guam / late afternoon US East.
- West Coast USA (UTC-8:00): 18 hours ahead. Overlap: 8:00 AM ChST = 2:00 PM PST (previous day).
- Japan (UTC+9:00): 1 hour behind. Overlap: 9:00 AM ChST = 8:00 AM JST. Good overlap for most of the day.
- Australia East (AEST, UTC+10:00): Same time as Guam. No difference.
- Philippines (UTC+8:00): 2 hours behind. Overlap: 8:00 AM ChST = 6:00 AM PHT. Limited morning overlap.
Because Guam does not change clocks, time differences are constant year-round. This simplifies recurring meetings.
Practical Guidance
When scheduling with Guam, always confirm the time zone as Pacific/Guam (ChST). Avoid confusing it with other UTC+10 zones that may observe DST. For travel, note that Guam is a U.S. territory, so U.S. customs and immigration apply. The island uses the U.S. dollar and English is widely spoken.
Frequently Asked Questions
What is the current time in Guam?
Guam uses Chamorro Standard Time (ChST), which is UTC+10:00. The time does not change for daylight saving, so it is always 10 hours ahead of UTC.
Does Guam observe daylight saving time?
No, Guam does not observe daylight saving time. The offset remains UTC+10:00 all year.
What countries use the same time zone as Guam?
Only Guam uses the Pacific/Guam zone. However, the Northern Mariana Islands (Pacific/Saipan) also uses ChST (UTC+10:00). Other territories at the same offset include parts of Australia (Brisbane), Papua New Guinea (Port Moresby), Russia (Vladivostok), and Micronesia (Chuuk).
How do I convert Guam time to my local time?
Guam is UTC+10:00. To convert, add 10 hours to UTC. For example, if UTC is 12:00, Guam is 22:00. For specific cities, use a time zone converter and select Pacific/Guam.
Is Guam time the same as Saipan time?
Yes, both Guam and Saipan (Northern Mariana Islands) use Chamorro Standard Time (UTC+10:00) and do not observe daylight saving. They are always the same time.
What is the best time to call Guam from the US East Coast?
From US Eastern Standard Time (UTC-5:00), Guam is 15 hours ahead. Good overlap: 8:00 AM ChST (Guam) = 5:00 PM EST (previous day). Early morning in Guam works well for late afternoon calls in the US.