Eastern time 
noun [mass noun]
1The standard time in a zone including the eastern states of the US and parts of Canada, specifically:
- (Eastern Standard Time, abbreviation EST) Standard time based on the mean solar time at the meridian 75° W, five hours behind GMT. (Eastern Daylight Time, abbreviation EDT) Eastern time during daylight saving time, four hours behind GMT..
- After 2 a.m. Sunday, 77 counties will be on Eastern Standard Time, 5 counties will be on Eastern Daylight Time and 10 counties will be on Central Daylight Time.
- The match will now be decided by the final game to be played on Friday, starting at 3.30 pm Eastern Standard Time.
2The standard time in a zone including eastern Australia, based on the mean solar time at the meridian 150° E. It is ten hours ahead of GMT, or nine hours ahead when summer time is observed.
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