Time difference between Guam and Japan: 1 hour
Guam
UTC+10
--:--:--
Japan
UTC+9
--:--:--
Guam is 1 hour ahead of Japan
Best time for a call or meeting
Guam 10:00–18:00 = Japan 09:00–17:00
Both cities are within business hours (9:00–18:00).
Convert a specific time
→ Japan
Hour-by-hour conversion
| Guam | Japan |
|---|---|
| 00:00 | 23:00 |
| 01:00 | 00:00 |
| 02:00 | 01:00 |
| 03:00 | 02:00 |
| 04:00 | 03:00 |
| 05:00 | 04:00 |
| 06:00 | 05:00 |
| 07:00 | 06:00 |
| 08:00 | 07:00 |
| 09:00 | 08:00 |
| 10:00 | 09:00 |
| 11:00 | 10:00 |
| 12:00 | 11:00 |
| 13:00 | 12:00 |
| 14:00 | 13:00 |
| 15:00 | 14:00 |
| 16:00 | 15:00 |
| 17:00 | 16:00 |
| 18:00 | 17:00 |
| 19:00 | 18:00 |
| 20:00 | 19:00 |
| 21:00 | 20:00 |
| 22:00 | 21:00 |
| 23:00 | 22:00 |
Business hours 9–18 Waking hours 7–22 Night / early morning
Daylight saving time can change the difference by season. Shown values reflect the current offset.
Frequently asked questions
How many hours is the time difference between Guam and Japan?
Guam is 1 hour ahead of Japan. When it is 12:00 noon in Guam, it is 11:00 in Japan.
Does daylight saving time affect the difference?
No. Neither place observes daylight saving time, so the difference stays the same all year.
What is the best time for a call or meeting?
Guam 10:00–18:00 = Japan 09:00–17:00. Both cities are within business hours (9:00–18:00).
Other countries & regions
Guam - South KoreaGuam - ChinaGuam - TaiwanGuam - Hong KongGuam - SingaporeGuam - ThailandGuam - VietnamGuam - PhilippinesGuam - CambodiaGuam - MalaysiaGuam - IndonesiaGuam - BaliGuam - IndiaGuam - UAEGuam - Saudi ArabiaGuam - TurkeyGuam - HawaiiGuam - United KingdomGuam - FranceGuam - GermanyGuam - ItalyGuam - SpainGuam - PortugalGuam - NetherlandsGuam - SwitzerlandGuam - SwedenGuam - PolandGuam - GreeceGuam - FinlandGuam - RussiaGuam - EgyptGuam - South AfricaGuam - United StatesGuam - CanadaGuam - MexicoGuam - BrazilGuam - ArgentinaGuam - ChileGuam - PeruGuam - ColombiaGuam - AustraliaGuam - New Zealand