What is Greenwich Mean Time? What does time minus three mean?

The Greenwich Meridian (Prime Meridian or Longitude Zero degrees) marks the starting point of every time zone in the World. GMT, Greenwich Mean (or Meridian) Time, is the mean (average) time that the earth takes to rotate from noon-to-noon. The starting point is Greenwich, Greater London, England.
GMT is World Time and the basis of every world time zone which sets the time of day and is at the center of the time zone map. GMT sets current time or official time around the globe. Most time changes are measured by GMT. Although GMT has been replaced by atomic time (UTC) it is still widely regarded as the correct time for every international time zone.
The time in Buenos Aires is: http://wwp.greenwichmeantime.com/time-zone/america/argentina/
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