Eastern Daylight Time

, a public art installation showing the time in New York City]]
The Eastern Time Zone ('''ET''') of the Western Hemisphere falls mostly along the east coast of Northern America and the west coast of South America . Its Time Offset is UTC-5 during Standard Time and UTC-4 during Daylight Saving Time . The clock time in this zone is based on the Mean Solar Time of the 75th degree Meridian west of the Greenwich Observatory .

In the United States and Canada , this time zone is generally called Eastern Time (ET). Specifically, it is '''Eastern Standard Time''' (EST) when observing Standard Time ( Winter ), and '''Eastern Daylight Time''' (EDT) when observing Daylight Saving Time ( Summer ).
The 1966 Uniform Time Act in the USA meant that EDT was instituted on the last Sunday in April, starting in 1966 , through out most of the USA and Canada.

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