| Since radio signals can cross multiple time zones
and the international date line, some worldwide standard for time
and date is needed. This standard is
coordinated universal time, abbreviated
UTC. This was formerly
known as Greenwich mean time
(GMT). Other terms used to refer to it include "Zulu time" (after
the "Z" often used after UTC times), "universal time," and "world
time."
UTC is used by international shortwave broadcasters in their
broadcast and program schedules. Ham radio operators, shortwave
listeners, the military, and utility radio services are also big
users of UTC.
A major source of confusion when using UTC is that
the date also follows UTC.
Suppose your local time zone is Central standard, and you want to
hear a shortwave program scheduled to be broadcast at 0400 UTC Saturday.
You do the math, and find that 0400 UTC is equal to 10:00 p.m. Central
standard time. If you tune in at 10:00 p.m. on Saturday, however,
you won't hear the program. Since the date is also UTC, you need
to listen at 10:00 p.m. Friday
to hear the program.
To hear the latest time in UTC, you can tune to stations
WWV, in Fort Collins, Colorado
and WWVH, Kauai, Hawaii
on 2500, 5000, 10000 and 15000 kHz to hear the time announced in
UTC each minute. WWV uses a man's voice to give the time, while
WWVH uses a female voice. If you live in the central or eastern
United States, and those frequencies aren't usable, you can tune
to station CHU, in Ottawa, Ontario,
Canada on 3330, 7335 and 14670 kHz, to hear the
current UTC time.
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