Time in Tennessee, as in all U.S. states, is regulated by the United States Department of Transportation.
65 of the 95 counties in the state of Tennessee, comprising about 73 percent of its total area, lie in the Central Time Zone. This encompasses the entirety of the western and middle grand divisions plus three counties in East Tennessee, while the remaining 30 counties lie in the Eastern Time Zone.65 counties, totaling 30,796 sq. mi. are in CT, while 30 counties, totaling 11,347 sq. mi. are in ET, based on individual Wikipedia county articles as of 2012-05-21.“Current time in Tennessee - Tennessee Time By County”. TimeTemperature.com. Retrieved 22 May 2013.
All counties observe Daylight Saving Time.
Time zone boundary areas
Central boundary counties Bledsoe (East) Cumberland (East) Fentress (Middle) Marion (East) Sequatchie (Middle) Pickett (Middle)
Eastern boundary counties Hamilton Morgan Rhea Roane Scott
IANA time zone database The IANA time zone database identifier for Tennessee is America/New_York for the Eastern Time Zone portion and America/Chicago for the Central Time Zone portion.
See also Time in the United States List of counties in Tennessee
References