To establish a standard time zone for Guam and the Commonwealth of the Northern Mariana Islands, and for other purposes.

[AI summary unavailable — showing source text] Amends the Calder Act to increase from eight to nine the number of standard time zones in the territory of the United States. Defines the ninth zone (embracing Guam and the Commonwealth of the Northern Mariana Islands), which shall be known as Chamorro standard time. Amends the Uniform Time Act of 1966 to require Guam and the Northern Mariana Islands to observe daylight savings time.…