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Chamorro Standard Time ChST
What Time Is It in Guam Right Now?
Local time in Hagatna
Today's Date and Day in Hagatna (GU):
Current Date and Time Information
Date&TimeDetails
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Guam Time Difference Tool - Convert Time Easily
Easily convert time zones between Guam and any city, country, or time zone in the world. Use this tool to check the current time difference and plan meetings, calls, or travel with confidence. Choose any location as the primary reference point to display the time difference.
Explore Professional Features04:26AM
🌍 Time Zone Converter Guide
Compare times across different zones and explore any moment in the day
Click the up arrow to make any timezone your reference point. All time differences will be calculated from this base.
Drag the grip icon to rearrange timezones in your preferred order. Base timezone cannot be dragged but others can be reordered.
Click the X button to delete a timezone from your comparison. Cannot remove if it's the only one left.
Use the slider below to explore different times. Drag to see how times change across all zones simultaneously.
View hour tiles showing the full 24-hour day. Use the time slider to navigate through different hours. Darker tiles indicate nighttime hours.
Switch between 12h/24h format and choose "Each" to set different formats per timezone or "All" to apply the same format to all zones.
💡 Pro tip: Add more timezones using the search above, then set one as your base to see all time differences at a glance!
Guam - Country Information
The flag of Guam
OceaniaCapital
Continent
ISO Code
Time Zone
IANA Timezone
Neighbors
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GhanaUTC+00:00GMT
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GuadeloupeUTC-04:00AST
Equatorial GuineaUTC+01:00WAT
GreeceUTC+03:00EEST
South Georgia and the South Sandwich IslandsUTC-02:00SGT
GuatemalaUTC-06:00CST
Guinea-BissauUTC+00:00GMT
GuyanaUTC-04:00GYT
Hong KongUTC+08:00HKT
HondurasUTC-06:00CST
CroatiaUTC+02:00CEST
HaitiUTC-04:00EDT
HungaryUTC+02:00CEST
IndonesiaUTC+07:00WIB
IrelandUTC+01:00IST
IsraelUTC+03:00IDTDaylight Saving Time Changes in Pacific/Guam
Track historical and upcoming DST transitions for Pacific/Guam from 1900 to 2050. See when clocks spring forward or fall back and how the UTC offset changes.
Current Status in Pacific/Guam
Chamorro Standard Time (ChST)
UTC+10
Next Change
No scheduled changes
| Date | Time | Change Type | UTC Offset |
|---|---|---|---|
| No DST changes found for the selected time zone and year range | |||
Guam Time Zones
| IANA Time Zone | Full Name | Abbr | UTC Offset | DST Offset |
|---|---|---|---|---|
Pacific/Guam CAPITAL | Chamorro Standard Time | ChST | +10 Hours | +10 Hours |
Guam: Where the US Day Begins First
Guam sits so far west across the International Date Line that it experiences each new day nearly a full day before the US mainland does — despite being American territory. The island runs on Chamorro Standard Time, fixed at UTC+10, with the IANA identifier Pacific/Guam. Check the live clock at the top of this page for the exact current time in Hagåtña and across the island.
Fast Facts on Guam's Clock
Detail | Info |
|---|---|
Time zone name | Chamorro Standard Time (ChST) |
UTC offset | UTC+10 |
IANA identifier | Pacific/Guam |
Daylight saving time | Not observed |
Zones on the island | 1 |
No Clock Changes, Ever
Guam does not observe daylight saving time. The offset holds at UTC+10 throughout the year, so there's no spring-forward or fall-back to track. Any future changes would depend on government decisions.
An American Island, an Asian Time Zone
Guam is an unincorporated US territory, but its clock has nothing in common with the mainland's. Sitting west of the International Date Line, Guam's time zone aligns far more closely with the Philippines, Papua New Guinea, and eastern Australia than with Washington or California. This is why the island markets itself as the place "where America's day begins" — its sunrise arrives roughly a full day ahead of the continental United States.
The Gap Between Guam and the Mainland
Location | Time Difference from Guam |
|---|---|
Same time (both fixed at UTC+10, no DST on either side) | |
Usually same time to 1 hour ahead, depending on seasonal clock changes there | |
Usually 17 to 18 hours behind Guam, depending on seasonal clock changes there | |
Usually 14 to 15 hours behind Guam, depending on seasonal clock changes there | |
Honolulu, Hawaii | Usually 20 hours behind Guam, since Hawaii does not observe daylight saving time |
Because Guam sits across the date line, the island isn't just hours ahead of the mainland — it's also on the next calendar day for part of each 24-hour cycle.
Scheduling a Call Across the Date Line
Caller Location | Good Calling Window (local time) | Equivalent in Guam |
|---|---|---|
Los Angeles (PT) | 9:00 AM–5:00 PM | Usually 2:00 AM–11:00 AM the next day |
New York (ET) | 9:00 AM–5:00 PM | Usually 11:00 PM–8:00 AM the next day |
Tokyo (JST) | 9:00 AM–5:00 PM | Same time, 9:00 AM–5:00 PM |
Calling windows may shift slightly when the caller's country switches between standard time and daylight saving time. Because of the date-line gap, teams coordinating between Guam and the US mainland often need to work across a calendar-day boundary, not just a clock difference.
Quick Answers on Guam's Time
What time is it in Guam right now?
Use the live clock at the top of this page for the exact current time on the island.
What time zone is Guam in?
Pacific/Guam, using Chamorro Standard Time at a fixed UTC+10.
Does Guam observe daylight saving time?
No, the offset stays the same all year.
Why is Guam's time so different from the rest of the United States?
Guam sits far west of the International Date Line, placing it in a time zone shared with parts of Asia and the Pacific rather than with the US mainland.
Is Guam the same time as Japan?
Yes, Guam and Tokyo share the same fixed UTC+10 offset year-round.
How many hours ahead of California is Guam?
Usually 17 to 18 hours, depending on California's seasonal clock changes.
Is Guam always a full day ahead of the US mainland?
Not always a full calendar day, but for part of each day Guam is already on the next date while the mainland is still on the previous one, due to the International Date Line.
Could Guam adopt daylight saving time in the future?
Any future changes would depend on government decisions.