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**Daylight
Saving Time: (also called Summer Time in many countries)
is a way of getting more out of the summer days by advancing
the clocks by one hour during the summer months. Then, the sun will
appear to rise one hour later in the morning when people are
usually asleep anyway, at the benefit of one hour longer evenings
when awake: The sunset and sunrise are one hour later than
during normal time.
**UTC/GMT:
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." {Greenwich mean time was based upon
the time at the zero degree meridian that crossed through
Greenwich, England. GMT became a world time and date standard
because it was used by Britain's Royal Navy and merchant fleet
during the nineteenth century. Today, UTC uses precise atomic
clocks, shortwave time signals, and satellites to ensure that
UTC remains a reliable, accurate standard for scientific and
navigational purposes. Despite the improvements in accuracy,
however, the same principles used in GMT have been carried
over into UTC. - The trick is to remember that UTC doesn't
change for daylight savings time.}
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