Time Zone History

Louisville, Kentucky time zone history

On standard time, clocks in Louisville, Kentucky run 43 minutes ahead of local mean solar time. Local mean time, UTC−5:43:02, ended in 1883.

UTC−5

Standard time is UTC−5 (EDT/EST); clocks go forward to UTC−4 on the second Sunday in March and back on the first Sunday in November.

Covers: Louisville area, Kentucky · tz database name America/Kentucky/Louisville

Convert a time from Louisville, Kentucky

Summer time in every year since 1970

UTC−6: 1 hour behind today’s standard timeUTC−5:43:02: 43 minutes behind today’s standard timeUTC−5: today’s standard timeUTC−4: 1 hour ahead of today’s standard timeUTC−6: 1 hour behind today’sstandard timeUTC−5:43:02: 43 minutes behindtoday’s standard timeUTC−5: today’s standard timeUTC−4: 1 hour ahead of today’sstandard time

How to read this chart

Before 1970

187018901910193019501970187019101950
JanFebMarAprMayJunJulAugSepOctNovDec1970198019902000201020202028JFMAMJJASOND1970198019902000201020202028

Standard time changes

DateChangeNew standard timeClock label
Before 1970
November 18, 1883Local mean time (UTC−5:43:02) replacedUTC−6CST
July 23, 1961Summer offset kept as standard time; clocks did not moveUTC−5EST
Since 1970
January 6, 1974Summer offset kept as standard time; clocks did not moveUTC−6CDT
October 27, 1974Summer offset kept as standard time; clocks did not moveUTC−5EST

Daylight saving periods

YearsClocks go forwardClocks go backShift and labels
Before 1970
1918–1919last Sunday in March, 02:00last Sunday in October, 02:001 hour, CST to CDT
1921May 1September 11 hour, CST to CDT
1941April 27September 281 hour, CST to CDT
1942February 9not that year1 hour, CST to CWT
1945not that yearSeptember 301 hour
1946April 28June 21 hour, CST to CDT
1950–1955last Sunday in April, 02:00last Sunday in September, 02:001 hour, CST to CDT
1956–1960last Sunday in April, 02:00last Sunday in October, 02:001 hour, CST to CDT
1961April 30not that year1 hour, CST to CDT
1968–1973last Sunday in April, 02:00last Sunday in October, 02:001 hour, EST to EDT
Since 1970
1975February 23October 261 hour, EST to EDT
1976–1986last Sunday in April, 02:00last Sunday in October, 02:001 hour, EST to EDT
1987–2006first Sunday in April, 02:00last Sunday in October, 02:001 hour, EST to EDT
2007–2037second Sunday in March, 02:00first Sunday in November, 02:001 hour, EST to EDT

Clock changes in 2026, 2027 and 2028

The clocks go forward 1 hour (EST to EDT) on March 8, 2026, March 14, 2027 and March 12, 2028 at 02:00 and back 1 hour (EDT to EST) on November 1, 2026, November 7, 2027 and November 5, 2028 at 02:00, local time.

Also on UTC−5

Marengo, Indiana (United States), Vevay, Indiana (United States), Petersburg, Indiana (United States), Vincennes, Indiana (United States), Indianapolis, Indiana (United States), Monticello, Kentucky (United States), Winamac, Indiana (United States), Detroit (United States), Toronto (Canada) and New York (United States) (nearest first; 13 more on the list of offsets).

Clocks next door since 1970

  • Marengo, Indiana (53 km): same time except 5,963 days in 1976–2005.
  • Vevay, Indiana (81 km): same time except 6,390 days in 1973 and 1975–2005.
  • Tell City, Indiana (94 km): usually 1 hour behind; different on 6,481 days in 1970–2026.
  • Petersburg, Indiana (135 km): same time except 8,731 days in 1970–2007.
  • Vincennes, Indiana (161 km): same time except 7,342 days in 1971–1973 and 1975–2007.