Open the Guam time converter: Go to https://www.xconvert.com/time-converter/guam. The page loads Guam time with Hagatna as the key reference, which is useful if you are planning a call with colleagues, checking hotel arrival timing, or coordinating military, shipping, or tourism schedules across the western Pacific.
Add comparison cities: Click + Add City and search for cities such as Tokyo, Sydney, and Los Angeles. These comparisons are practical because Guam is closely linked to Asia-Pacific travel routes, Australian business hours, and US-based organizations that need to coordinate across a large time gap.
Select a working time window: Click Select to enter selection mode, then drag across the Guam row on the 24-hour grid to highlight a time block, such as 9:00 AM to 11:00 AM ChST. This lets you immediately see that the same window is 8:00 AM to 10:00 AM in Tokyo, 11:00 AM to 1:00 PM in Sydney during Australian Eastern Standard Time, and 4:00 PM to 6:00 PM in Los Angeles on the previous day during Pacific Daylight Time, helping you avoid scheduling a meeting overnight for US participants.
Export and share the result: After selecting a range, use the export options shown on the page: ICS download, Google Calendar, Gmail, Copy to clipboard, or Share link. This is especially useful for sending a confirmed Guam-based meeting time to remote teams, travel coordinators, or clients so everyone sees the event in their own local time automatically.

Time Zones in Guam

Guam has one official time zone: Chamorro Standard Time (ChST), which is UTC+10:00. There are no secondary regional time zones within Guam, so Hagatna, Dededo, Tamuning, Yigo, and the rest of the island all follow the same clock year-round.

A key feature of Guam time is that it is a fixed whole-hour offset, not a half-hour or quarter-hour zone like India (UTC+5:30) or Nepal (UTC+5:45). Guam is 10 hours ahead of UTC, 1 hour ahead of Japan and South Korea, and usually 2 hours ahead of Singapore and Beijing, which makes it important to check exact overlap windows when arranging business calls in the Asia-Pacific region.

Guam does not switch between standard time and daylight time, unlike much of the mainland United States. Because of that, the time difference between Guam and cities such as New York, Los Angeles, or London changes seasonally when those places enter or leave DST, even though Guam itself stays on ChST (UTC+10) throughout the year.

Guam Country Details

Guam is an unincorporated US territory in Oceania, located in the western Pacific Ocean, and its capital is Hagatna. The island has a population of 165,768 and a land area of 549 km², making it a relatively small but strategically important Pacific hub for tourism, aviation, and US military operations.

The official currency used in Guam is the US Dollar (USD), which is convenient for travelers arriving from the United States and for businesses dealing with US-based contracts, government activity, and retail pricing. Because Guam uses USD rather than a separate local currency, budgeting for hotels, dining, and transportation is straightforward for American visitors.

The listed languages are en-GU and ch-GU, reflecting the island’s use of English and Chamorro in daily life and local identity. Guam’s dialing code is ++1-671, which places it within the North American Numbering Plan, so calls to Guam often look similar to dialing other US-related destinations even though the island is far from the continental United States.

Daylight Saving Time in Guam

Guam does not observe Daylight Saving Time. Clocks in Guam do not move forward in spring and do not move back in autumn, so the island remains on Chamorro Standard Time (UTC+10:00) for all 12 months of the year.

There have been no recent DST clock-change schedules to track for Guam because the territory maintains a stable year-round time standard. This consistency is useful for airlines, military coordination, hospitality businesses, and remote teams, since a 10:00 AM meeting in Guam always stays at 10:00 AM local time even while partner offices in the US, Europe, or Australia may shift seasonally.

All parts of Guam follow the same rule, so there are no internal regional differences in DST policy. The only changes users need to watch are in the other location they are comparing against, such as the United States switching on the second Sunday in March and off on the first Sunday in November, or the UK changing on the last Sunday in March and the last Sunday in October.

Frequently Asked Questions

how many time zones does Guam have?

Guam has one time zone for the entire territory. The whole island, including Hagatna and all major villages, uses Chamorro Standard Time (ChST), UTC+10:00, with no regional splits like those found in large countries such as the United States or Russia.

does Guam use daylight saving time?

No, Guam does not use daylight saving time. Its clocks stay on UTC+10:00 all year, so there are no spring or autumn clock changes to track within the territory itself.

what is the time difference between Guam and UTC?

Guam is 10 hours ahead of UTC, written as UTC+10:00. That means when it is 12:00 noon UTC, it is 10:00 PM in Guam on the same calendar day; this fixed offset makes Guam easy to compare with other Asia-Pacific locations.

what currency does Guam use?

Guam uses the US Dollar (USD) as its official currency. This is important for travelers, online shoppers, and business visitors because prices, wages, and most financial transactions are aligned with the US dollar rather than a separate Pacific island currency.

what is the dialing code for Guam?

The dialing code for Guam is ++1-671. In practice, Guam is part of the North American Numbering Plan, so international callers typically use +1 671 followed by the local number when placing calls.

what time zone abbreviation is used in Guam?

The standard abbreviation used in Guam is ChST, which stands for Chamorro Standard Time. This abbreviation is commonly used in flight schedules, world clock tools, and international meeting planning where Guam needs to be distinguished from US mainland time zones such as PST, MST, CST, or EST.

is Guam on the same time as Japan or Australia?

Guam is not exactly the same as Japan; Guam is 1 hour ahead of Japan, since Japan uses UTC+9 while Guam uses UTC+10. Compared with Australia, it depends on the city and season: Guam matches some eastern Australian locations during certain parts of the year, but differences change when Australian states observe or do not observe daylight saving time.

why does the time difference between Guam and the US change during the year?

The time difference changes because Guam stays fixed on UTC+10, while many US locations observe daylight saving time. For example, when Los Angeles is on Pacific Standard Time, Guam is 18 hours ahead, but when Los Angeles switches to Pacific Daylight Time, Guam is 17 hours ahead, which can affect meeting planning and flight coordination.