Time zone
Chamorro Time Area Codes
Chamorro Time covers Guam and the Northern Mariana Islands in the western Pacific. 2 area codes across 2 states and territories fall in this zone.
What the Chamorro Time zone covers
The Chamorro Time zone includes Guam, Northern Mariana Islands. Chamorro Time covers Guam and the Northern Mariana Islands in the western Pacific.
UTC offset and daylight saving
This zone runs at UTC+10 year-round (ChST). It does not observe daylight saving time. Guam is 14 hours ahead of US Eastern Standard Time and is already in the next calendar day for most of the mainland's afternoon.
Best time to call this zone
Standard business hours (9 a.m. to 5 p.m.) in this zone are when you're most likely to reach an office or store. Guam is 14 hours ahead of US Eastern Standard Time and is already in the next calendar day for most of the mainland's afternoon. If you only have a phone number, our phone number finder tells you which zone it belongs to.
Full list
Every Chamorro Time area code
| Code | Main city | State |
|---|---|---|
| 670 | Saipan | Northern Mariana Islands |
| 671 | Hagåtña | Guam |
Other zones: Eastern Time · Central Time · Mountain Time · Pacific Time · Alaska Time · Hawaii–Aleutian Time · Atlantic Time · Samoa Time.
Quick answers
Chamorro Time FAQ
What is the UTC offset for Chamorro Time?
Chamorro Time is UTC+10 year-round (ChST).
Does Chamorro Time use daylight saving time?
No, this zone keeps the same time year-round.
How many area codes are in Chamorro Time?
2 US area codes fall in the Chamorro Time zone, across 2 states and territories.