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Appendix A
Universal Time vs. Local Time
We use Universal Coordinated Time (UTC) to define a time that doesn't
depend on where we are on Earth. Universal Time, Greenwich Mean Time
(GMT), and Zulu (Z), are based at the prime meridian (0° longitude) of Earth and
are used by scientists to avoid confusion of time zones.
The map and charts below guide the conversion to local time from Universal
Time.
Figure 27 - Local time to UTC time conversion
On the west coast of the United States, subtract 8 hours (7 hours during daylight
savings time) from Universal Time to get local time. For example, when it's 01:00
UTC, it's 5:00 pm in Seattle (PST) or 6:00 pm (PDT).
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