What time is it in area code 670?
Area code 670 is in the Chamorro time zone: UTC+10 all year, because Northern Mariana Islands does not change its clocks. It stays on ChST (UTC+10) through the year, so the gap to places that do change their clocks shifts by an hour twice a year. NANPA records this code by UTC offset (+10), not by a continental zone name. When it is 9 am in 670, it is 6 pm Eastern the previous day, 5 pm Central the previous day, 4 pm Mountain the previous day and 3 pm Pacific the previous day – the working day here runs while the mainland is asleep, which is why business hours here never overlap with east-coast ones. The code's largest rate centers are SAIPAN, TINIAN and ROTA, as NANPA abbreviates them.
Clocks run in your browser from the IANA time zone database, so they stay right between page rebuilds.
Offsets and clock changes
| Zone | Standard | Daylight saving | Changes in 2026 |
|---|---|---|---|
| Chamorro | ChST UTC+10 | not observed | none |
Questions about 670 and time
What time is it in area code 670?
The clock above shows it live. 670 keeps Chamorro time, UTC+10 in winter and the same all year.
Does area code 670 observe daylight saving time?
No. Northern Mariana Islands stays on ChST all year.
Is 670 the same time as New York?
No. New York is Eastern time; 670 is Chamorro (UTC+10 against UTC in winter), so work out the difference from the clock above rather than assuming.
Why does a 670 caller reach me at an odd hour?
Two common reasons. Either the clocks differ by more than you expected – the offset changes twice a year and not everywhere on the same date – or the caller ID is not really 670 at all. Spam callers fake a local-looking number, so the displayed code says nothing about where the call came from.
Sources
- NANPA – NPA Database (npa_report.csv), file date 11/01/2026, retrieved Nov 1, 2026
- IANA Time Zone Database (tzdata), as shipped with this build, retrieved Nov 1, 2026