Time in the United States

UTC−10:30 is an identifier for a time offset from UTC of −10:30.

time zones in the USA

shortwave radio station broadcasting time signals

thumb|right|300px|WWVH antenna field WWVH is the callsign of the U.S. National Institute of Standards and Technology's shortwave radio time signal station located at the Pacific Missile Range Facility Barking Sands, in Kekaha, on the island of Kauai in the state of Hawaii.

WWVB is a longwave time signal radio station near Fort Collins, Colorado, and is operated by the National Institute of Standards and Technology (NIST). Most radio-controlled clocks in North America use WWVB's transmissions to set the correct time.