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Guam does NOT observe Daylight Saving Time. Local clocks remain constant throughout the year on standard time, with no seasonal spring/fall 1-hour adjustments.
Optimal overlapping time windows to schedule remote team meetings, vendor synchronization, and client calls between major global economic regions and Guam.
Timezone Twins: The following countries and territories share the exact same standard clock as Guam:
The directory below details the official time zone designations, IANA database identifiers, real-time clocks, and standard UTC offsets active across Guam.
Complete schedule of national holidays, bank closures, religious festivals, and observances. Switch between years (2024–2028) and filter by holiday category:
| Date | Holiday Name | Classification | Calendar Basis | Office Status |
|---|---|---|---|---|
| 2026-01-01 | New Year's Day | Public | gregorian | Closed 🔴 |
| 2026-01-19 | Martin Luther King, Jr. Day | Observance | gregorian | Open 🟢 |
| 2026-02-16 | Presidents' Day | Observance | gregorian | Open 🟢 |
| 2026-02-20 | Guam Founders Day | Cultural | gregorian | Open 🟢 |
| 2026-03-15 | Chamorro Day | Cultural | gregorian | Open 🟢 |
| 2026-03-06 | Magellan Day | Cultural | gregorian | Open 🟢 |
| 2026-05-25 | Memorial Day | Observance | gregorian | Open 🟢 |
| 2026-07-04 | Independence Day | Public | gregorian | Closed 🔴 |
| 2026-07-21 | Guam Liberation Day | Public | gregorian | Closed 🔴 |
| 2026-09-07 | Labor Day | Observance | gregorian | Open 🟢 |
| 2026-10-12 | Columbus Day | Observance | gregorian | Open 🟢 |
| 2026-11-11 | Veterans Day | Observance | gregorian | Open 🟢 |
| 2026-11-26 | Thanksgiving Day | Observance | gregorian | Open 🟢 |
| 2026-12-25 | Christmas Day | Public | gregorian | Closed 🔴 |
| 2026-12-08 | Immaculate Conception | Religious | gregorian | Open 🟢 |
| 2026-12-27 | Feast of the Holy Family | Religious | gregorian | Open 🟢 |
Physiological time difference and circadian adjustment expectations when traveling to Guam:
Official format conventions and time standards recognized in Guam:
| Preferred Date Format | MM-DD-YYYY |
|---|---|
| Standard Clock Format | 12-hour |
| First Day of the Week | Sunday |
| 24-Hour Military Clock Used? | No (Primarily 12-hour AM/PM) |
Guam transitioned to Guam Standard Time (GST) following US administration after WWII.
The current time in Guam is based on its standard time zone with a UTC offset of UTC+10:00. Real-time clocks above are synchronized with high-precision atomic stratum-1 time servers.
No, Guam does not observe Daylight Saving Time. Clocks remain on standard time all year.
Standard business hours in Guam are typically 08:00 - 17:00, Monday through Friday.
Refer to the Remote Work Call Planner section above for region-specific recommended calling windows from the US, Europe, and Asia-Pacific.
The international telephone dialing code for Guam is ++1-671.