Local time is compared to the time zone that is centered at the historically significant naval observatory at Greenwich, England. The time at that location is Greenwich Mean Time (GMT). More recent references use UT for Universal Time (UT) instead of GMT.
Conference Call between New York and Paris
A project manager in New York is five time zones west of the reference zone, so the time is given as UT –5 (or GMT –5). If it is noon in the reference zone, it is 7 a.m. (five hours earlier) in New York. The manager would like to contact a project team member in Paris, France. Paris is one time zone east of the reference zone (UT +1 or GMT +1). If it is noon (12:00) in the reference zone, it is 13:00 (1 p.m.) in Paris.
This means that there is a six-hour difference between New York and Paris. If the project manager waits until after lunch to place the call (1 p.m. in New York), it might be too late in the day in Paris (7 p.m.) to reach someone.
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