Indiana is generally in the eastern time zone, except for 12 counties in the western corner border regions, which are in the central time zone. Cities in Eastern Standard Time Zone include South Bend, Granger, Goshen, Angola, Auburn, Plymouth, Warsaw, Fort Wayne, Rochester, Bluffton, Peru, Logansport, Monticello, Kokomo, Lafayette, Frankfort, Muncie, Indianapolis, Richmond, Terre Haute, Bloominton, Columbus, Linton, Bedford, Seymour, North Vemon, New Albany and Vincennes. Cities in the Central Standard Time Zone include Gary, Princeton, Evansville, Boonville, and Tell City. Daylight saving times are used in Kentucky time zones during the summer.
Currently, most parts observe Eastern Daylight Time, the upper and lower corner regions observe central summer time. In the late 1940s, the use of daylight saving time, known as fast time, became popular in cities. Indiana is officially in the central time zone, but some communities choose to follow fast time throughout the year, essentially aligning with the Eastern time zone. Indiana is divided into two time zones.
Most of Indiana, including the cities of Indianapolis and Fort Wayne, is in the Eastern Time Zone and observes daylight saving time, so there are two different clocks depending on the time of year.