Chamorro time · Guam

Guam time now, live flip clock

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Guam keeps one time zone, Chamorro Standard Time, ChST, UTC+10, and its clocks do not change. The clock above shows Guam's time live, with seconds.

Updated · Time zone data 2026e · Sources

Time zone in Guam

Hagåtña, the capital, keeps the same time as Dededo, Yigo and Tamuning, the most populous villages. All 19 villages share one clock. The Northern Mariana Islands, Saipan included, keep the same time too.

Time zone
Chamorro Time
Standard time
ChST, UTC+10
Daylight saving time
Not observed
Main cities
Dededo Village, Yigo Village, Tamuning-Tumon-Harmon Village, Tamuning

How many hours ahead or behind Guam

On 25 October 2026, Honolulu is 20 hours behind Guam.

CityDifference from Guam
Honolulu20 hours behind
Los Angeles17 hours behind
New York14 hours behind
Manila2 hours behind
Tokyo1 hour behind
Seoul1 hour behind
Sydney1 hour ahead
Kolkata4 hours 30 minutes behind
Your time zoneDetected after this page loads

Convert a time between any two placesDaylight saving dates around the world

How Guam keeps its time

Where America's day begins
+1 dayahead of the US mainland for most of the day
The Guam Visitors Bureau calls the island "Where America's Day Begins". Guam lies west of the International Date Line, so its date runs ahead of the US mainland. For most of the day, Guam is already on the next date there.
Source Guam Visitors Bureau, General information
Chamorro time, by US law
ChSTthe time zone database's code
Congress named Guam's time Chamorro Standard Time. Federal rules put Guam and the Northern Mariana Islands in the ninth US time zone. The name refers to the culture and people of the islands. The time zone database says there is no official short code. It writes ChST.
Sources Cornell LII, 15 U.S. Code 263, standard time zones, GovInfo, Public Law 106-564, time zone for Guam and the Northern Mariana Islands, Cornell LII, 49 CFR 71.14, Chamorro zone, GovInfo, Federal Register, establishment of the Chamorro standard time zone, IANA time zone database, Australasia zones file
Daylight saving, tried and dropped
0clock changes a year
Guam does not change its clocks. In the past, governors moved them forward an hour by executive order several times. Each time, Guam went back to standard time. The last order to end it cited students waiting at bus stops before the sun had fully risen. That order quoted Guam's Government Code, which called the island's time Guam Standard Time.
Sources Government of Guam, Executive Order 77-18, Guam Standard Time (archived copy), IANA time zone database, Australasia zones file, NIST, Daylight saving time

Questions about time in Guam

What time zone is Guam in?

Guam keeps one time zone, Chamorro Standard Time, ChST, UTC+10. US federal law names it, and federal rules place Guam in the ninth US time zone. The Northern Mariana Islands share the same zone. Hagåtña, Dededo, Yigo and Tamuning all show the same time. The clocks do not change during the year.

Does Guam have daylight saving time?

No. Guam stays on ChST, UTC+10 all year. NIST lists it among the places that do not observe daylight saving time. Guam tried it in the past, by governor's order, and went back to standard time each time. The gap with the US mainland still shifts twice a year, because most states change their clocks.

What is the time difference between Guam and the US mainland?

New York is 15 hours behind Guam in the US winter, and one hour less in summer. Los Angeles is 18 hours behind Guam in winter, and one hour less in summer. So when the working day starts in Guam, it is still the previous afternoon on the US West Coast.

Is Guam on the same time as Saipan?

Yes. Saipan and the rest of the Northern Mariana Islands keep Chamorro Standard Time, ChST, UTC+10, like Guam. Federal rules put both in the same time zone, and neither changes its clocks. So Guam and Saipan show the same time in every season.

What is the time difference between Guam and the Philippines?

Manila is 2 hours behind Guam all year, because neither place changes its clocks. So the gap stays the same in every season. Tokyo and Seoul are 1 hour behind Guam. Japan and South Korea do not change their clocks either, so that gap holds all year too.

What is the time difference between Guam and India?

India is 4 hours 30 minutes behind Guam all year, because neither place changes its clocks. The gap does not move with the seasons. So when offices open in Guam in the morning, it is still the early hours in Mumbai and Delhi.

Time zone names for developers
IANA zoneStandard timeDaylight saving time
Pacific/GuamChST, UTC+10No

Sources

We checked each fact on this page against these sources on 1 October 2026. Times, offsets and clock changes come from the time zone database.

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