time zones in the individual states

United States of America

Directions for finding times manually.

The times given below are no more accurate than the time and time zone setting of your computer. According to your computer, UTC time is

Show times in: 12-hour format 24-hour format

State	Add to UTC	Daylight Saving time
Alabama	−6	−5
Alaska, see map
—east of line	−9	-8
—west of line	−10	no
Arizona	−7	no, but it is observed in the Navajo Nation. See note 1, below.
Arkansas	−6	−5
California	−8	−7
Colorado	−7	−6
Connecticut	−5	−4
Delaware	−5	−4
Dist. of Columbia	−5	−4
Florida	−5	−4
—panhandle, west of the Appalachicola River	−6	−5
Georgia	−5	−4
Hawaii	−9	no
Idaho, see map
—east of line	−7	−6
—west of line	−8	−7
Illinois	−6	−5
Indiana, see map
—east of line (most of state)	−5	−4
—west of line (greater Chicago and counties near Evansville, IN)	−6	−5
—greater Cincinnati and counties near Louisville, KY	−5	−4
Iowa	−6	−5
Kansas, see map
—east of line	−6	−5
—west of line	−7	−6
Kentucky, see map
—east of line	−5	−4
—west of line	−6	−5
Louisiana	−6	−5
Maine	−5	−4
Maryland	−5	−4
Massachusetts	−5	−4
Michigan	−5	−4
Minnesota	−6	−5
Mississippi	−6	−5
Missouri	−6	−5
Montana	−7	−6
Nebraska, see map
—east of line	−6	−5
—west of line	−7	−6
Nevada	−8	−7
New Hampshire	−5	−4
New Jersey	−5	−4
New Mexico	−7	−6
New York	−5	−4
North Carolina	−5	−4
North Dakota, see map
—east of line	−6	−5
—west of line	−7	−6
Ohio	−5	−4
Oklahoma	−6	−5
Oregon, see map
—east of line	−7	−6
—west of line	−8	−7
Pennsylvania	−5	−4
Rhode Island	−5	−4
South Carolina	−5	−4
South Dakota, see map
—east of line	−6	−5
—west of line	−7	−6
Tennessee
—east of line	−5	−4
—west of line	−6	−5
Texas, see map
—east of line	−6	−5
—west of line	−7	−6
Utah	−7	−6
Vermont	−5	−4
Virginia	−5	−4
Washington	−8	−7
West Virginia	−5	−4
Wisconsin	−6	−5
Wyoming	−7	−6

1. History of daylight saving in Arizona: www.azlibrary.gov/links/daylight.cfm

History of U.S. time zones

Allen railroad action 18 November 1883. Act of Congress March 1918.

Ian R. Bartky.
The Adoption of Standard Time.
Technology and Culture, volume 30, number 1 (January 1989).

Contains a multitude of citations.

Ian R. Bartky and Elisabeth Harrison.
Standard and Daylight Saving Time.
Scientific American, volume 240, pages 46-53 (May 1979).

Code of Federal Regulations, Title 49, Part 71. Available on the Web at www.access.gpo.gov/nara/cfr/waisidx_99/49cfr71_99.html

Office of the Secretary. U.S. Dep't of Transportation.
Standard Time in the United States. A History of Standard and Daylight Saving Time in the United States and an Analysis of the Related Laws.
Washington: U. S. Gov't Printing Office, 1970.