Standard Time: Standard Time is local time without a daylight savings time offset.At this point it is useful to define three different flavors of local time: The offset differs in the summer because of daylight savings time, or DST. The offset -8:00 indicates that Pacific Time is obtained from GMT by adding -8:00, that is, by subtracting 8 hours. We use the two terms interchangeably in ICU since ICU does not concern itself with either leap seconds or historical behavior.) Using this system, Pacific Time is expressed as GMT-8:00, or GMT-7:00 in the summer. (This is similar, but not precisely identical, to Universal Coordinated Time, or UTC. Local time in Greenwich is referred to as Greenwich Mean Time, or GMT. To make things simple, instead of relating time zones to one another, all time zones are related to a common reference point.įor historical reasons, the reference point is Greenwich, England. For example, in the United States, Pacific Time is three hours earlier than Eastern Time when it’s 6 P.M.
#List of time zones update#
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