What is the difference between CHST and JST?
CHST is 1 hour ahead of JST. While Japan follows Japan Standard Time, the Mariana Islands and Guam use CHST.
UTC time
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CHST
Chamorro Standard Time
17 Nov 2025
Frequently Asked Questions
Does this area observe DST?
No, this area does not observe daylight saving time and stays on standard hours throughout the year.
Which major cities follow this pattern?
Cities in Guam and the Northern Mariana Islands, such as Hagåtña and Saipan, follow this schedule.
What areas share the same hours?
The Federated States of Micronesia and parts of Kiribati share the same schedule.
How does this compare with UTC?
CHST is 10 hours ahead of UTC.
Why doesn't this area observe DST?
The region does not observe daylight saving time, as the consistent climate and daylight hours throughout the year make it unnecessary.
How did this system get established?
CHST was established to standardize time across the Mariana Islands and Guam, aligning with their location in the Pacific.
What are the typical work hours here?
Business hours typically run from 8:00 AM to 5:00 PM, with a lunch break.
What is the economic importance of this area?
Guam and the Northern Mariana Islands are vital for U.S. military presence in the Pacific, tourism, and trade.