All locations will be closed Dec 15, 22-25, 29 and Jan 1 and close early during the last 2 weeks of December. See December Calendar for details.
Currently, Arizona, Hawaii, the eastern time zone portion of Indiana, Puerto Rico, the U.S. Virgin Islands and American Samoa do not observe Daylight Saving Time.
Source: World Almanac and Book of Facts 2005, p. 387. California Energy Commission web site.