The Eastern Time Zone (ET) is an area 5 hours behind Greenwich Mean Time (GMT-5) during the winter months (referred to as Eastern Standard Time or EST) and 4 hours behind Greenwich Mean Time (GMT-4) during the summer months (referred to as Eastern Daylight Time or EDT).
Apply the offset: To convert from GMT to local time, add the time difference if the local time zone is ahead of GMT, or subtract it if the local time zone is behind GMT. For example, if the local time zone is GMT-5, subtract 5 hours from the GMT time to convert to local time.
What does GMT mean? Greenwich Mean Time is the yearly average (or 'mean') of the time each day when the Sun crosses the Prime Meridian at the Royal Observatory Greenwich.
Greenwich Mean Time is calculated by using the sun. When the sun is at its highest point, exactly above the Prime Meridian, this means that it is 12:00 noon at Greenwich. The Prime Meridian is the imaginary line that splits the Earth up into two equal halves: the Western Hemisphere and the Eastern Hemisphere.
The GMT (Greenwich Mean Time) timezone is primarily associated with the United Kingdom, but it is also used in several other countries, including Portugal, Iceland, and some African nations such as Ghana and Senegal. Keep in mind that some regions may use GMT as a standard time or in conjunction with other time zones.
Greenwich Mean Time is calculated by using the sun. When the sun is at its highest point, exactly above the Prime Meridian, this means that it is 12:00 noon at Greenwich. The Prime Meridian is the imaginary line that splits the Earth up into two equal halves: the Western Hemisphere and the Eastern Hemisphere.
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