Historically distinct IANA time zone
America/Kentucky/Louisville
Local time now
EDT · current offset
- Countries
- United States of America
- GPS reference
- 38.25° N, 85.76° W
- Data source
- IANA northamerica
- Aliases
- America/Louisville
- Rule groups
- US, Louisville
United States of AmericaEastern - KY (Louisville area)
Geographic context
Where this clock belongs
The map marks the IANA reference location and associated country, not a time-zone boundary.
GPS reference: 38.25° N, 85.76° W. Associated countries: US.
The Wikipedia link provides additional context; it is not evidence for a historical claim. Transition data comes from the IANA source file.
Notes from the time database
The story behind the clock
These source notes describe a period or rule. They do not, by themselves, establish a causal claim for a particular clock change.
The Louisville & Nashville Railroad's 1883-11-18 change occurred at 10:00 old local time; train were supposed to come to a standstill for precisely 18 minutes. See Bartky Fig. 1 (page 50). It is not clear how this matched civil time in Louisville, so for now continue to assume Louisville switched at noon new local time, like New York. From the contemporary source given by Alois Treindl, the switch in Louisville on 1946-04-28 was on 00:01 That source was the Louisville Courier-Journal, 1946-04-27, p 4. Shanks gives 02:00 for all 20th-century transition times in Louisville. Evidently this is wrong for spring 1946. Although also likely wrong for other dates, we have no data. Part of Kentucky left its clocks alone in 1974. This also includes Clark, Floyd, and Harrison counties in Indiana.
War
Peace
Original IANA source file: northamerica.
A shared present
Same clock today, different past
These nearby zones follow the same current annual pattern, yet retain their own historical record.
- America/Indiana/MarengoUnited States of America · 53 km from the reference location · Same annual clock since 2006
- America/Indiana/VevayUnited States of America · 81 km from the reference location · Same annual clock since 2006
- America/Indiana/PetersburgUnited States of America · 135 km from the reference location · Same annual clock since 2008
Civil-time record
Recorded changes over time
From 1883 to 2027 · 158 recorded transitions
Recurring daylight-saving changes are grouped separately when JavaScript is available.
Notable changes
One-off changes and transitions outside the recurring seasonal rhythm.
- -06:00 · CSTStandard time applies
- -05:00 · CDTDaylight saving time begins
- -06:00 · CSTStandard time applies
- -05:00 · CDTDaylight saving time begins
- -06:00 · CSTStandard time applies
- -05:00 · CDTDaylight saving time begins
Browse every recorded transition
| Local time after transition | Offset after | Abbreviation | Rule |
|---|---|---|---|
| 1883-11-18 12:00 | -06:00 | CST | Standard time |
| 1918-03-31 03:00 | -05:00 | CDT | Daylight saving time |
| 1918-10-27 01:00 | -06:00 | CST | Standard time |
| 1919-03-30 03:00 | -05:00 | CDT | Daylight saving time |
| 1919-10-26 01:00 | -06:00 | CST | Standard time |
| 1921-05-01 03:00 | -05:00 | CDT | Daylight saving time |
| 1921-09-01 01:00 | -06:00 | CST | Standard time |
| 1941-04-27 03:00 | -05:00 | CDT | Daylight saving time |
| 1941-09-28 01:00 | -06:00 | CST | Standard time |
| 1942-02-09 03:00 | -05:00 | CWT | Daylight saving time |
| 1945-08-14 18:00 | -05:00 | CPT | Daylight saving time |
| 1945-09-30 01:00 | -06:00 | CST | Standard time |
| 1946-04-28 01:01 | -05:00 | CDT | Daylight saving time |
| 1946-06-02 01:00 | -06:00 | CST | Standard time |
| 1950-04-30 03:00 | -05:00 | CDT | Daylight saving time |
| 1950-09-24 01:00 | -06:00 | CST | Standard time |
| 1951-04-29 03:00 | -05:00 | CDT | Daylight saving time |
| 1951-09-30 01:00 | -06:00 | CST | Standard time |
| 1952-04-27 03:00 | -05:00 | CDT | Daylight saving time |
| 1952-09-28 01:00 | -06:00 | CST | Standard time |
| 1953-04-26 03:00 | -05:00 | CDT | Daylight saving time |
| 1953-09-27 01:00 | -06:00 | CST | Standard time |
| 1954-04-25 03:00 | -05:00 | CDT | Daylight saving time |
| 1954-09-26 01:00 | -06:00 | CST | Standard time |
| 1955-04-24 03:00 | -05:00 | CDT | Daylight saving time |
| 1955-09-25 01:00 | -06:00 | CST | Standard time |
| 1956-04-29 03:00 | -05:00 | CDT | Daylight saving time |
| 1956-10-28 01:00 | -06:00 | CST | Standard time |
| 1957-04-28 03:00 | -05:00 | CDT | Daylight saving time |
| 1957-10-27 01:00 | -06:00 | CST | Standard time |
| 1958-04-27 03:00 | -05:00 | CDT | Daylight saving time |
| 1958-10-26 01:00 | -06:00 | CST | Standard time |
| 1959-04-26 03:00 | -05:00 | CDT | Daylight saving time |
| 1959-10-25 01:00 | -06:00 | CST | Standard time |
| 1960-04-24 03:00 | -05:00 | CDT | Daylight saving time |
| 1960-10-30 01:00 | -06:00 | CST | Standard time |
| 1961-04-30 03:00 | -05:00 | CDT | Daylight saving time |
| 1961-07-23 02:00 | -05:00 | EST | Standard time |
| 1968-04-28 03:00 | -04:00 | EDT | Daylight saving time |
| 1968-10-27 01:00 | -05:00 | EST | Standard time |
| 1969-04-27 03:00 | -04:00 | EDT | Daylight saving time |
| 1969-10-26 01:00 | -05:00 | EST | Standard time |
| 1970-04-26 03:00 | -04:00 | EDT | Daylight saving time |
| 1970-10-25 01:00 | -05:00 | EST | Standard time |
| 1971-04-25 03:00 | -04:00 | EDT | Daylight saving time |
| 1971-10-31 01:00 | -05:00 | EST | Standard time |
| 1972-04-30 03:00 | -04:00 | EDT | Daylight saving time |
| 1972-10-29 01:00 | -05:00 | EST | Standard time |
| 1973-04-29 03:00 | -04:00 | EDT | Daylight saving time |
| 1973-10-28 01:00 | -05:00 | EST | Standard time |
| 1974-01-06 02:00 | -05:00 | CDT | Daylight saving time |
| 1974-10-27 02:00 | -05:00 | EST | Standard time |
| 1975-02-23 03:00 | -04:00 | EDT | Daylight saving time |
| 1975-10-26 01:00 | -05:00 | EST | Standard time |
| 1976-04-25 03:00 | -04:00 | EDT | Daylight saving time |
| 1976-10-31 01:00 | -05:00 | EST | Standard time |
| 1977-04-24 03:00 | -04:00 | EDT | Daylight saving time |
| 1977-10-30 01:00 | -05:00 | EST | Standard time |
| 1978-04-30 03:00 | -04:00 | EDT | Daylight saving time |
| 1978-10-29 01:00 | -05:00 | EST | Standard time |
| 1979-04-29 03:00 | -04:00 | EDT | Daylight saving time |
| 1979-10-28 01:00 | -05:00 | EST | Standard time |
| 1980-04-27 03:00 | -04:00 | EDT | Daylight saving time |
| 1980-10-26 01:00 | -05:00 | EST | Standard time |
| 1981-04-26 03:00 | -04:00 | EDT | Daylight saving time |
| 1981-10-25 01:00 | -05:00 | EST | Standard time |
| 1982-04-25 03:00 | -04:00 | EDT | Daylight saving time |
| 1982-10-31 01:00 | -05:00 | EST | Standard time |
| 1983-04-24 03:00 | -04:00 | EDT | Daylight saving time |
| 1983-10-30 01:00 | -05:00 | EST | Standard time |
| 1984-04-29 03:00 | -04:00 | EDT | Daylight saving time |
| 1984-10-28 01:00 | -05:00 | EST | Standard time |
| 1985-04-28 03:00 | -04:00 | EDT | Daylight saving time |
| 1985-10-27 01:00 | -05:00 | EST | Standard time |
| 1986-04-27 03:00 | -04:00 | EDT | Daylight saving time |
| 1986-10-26 01:00 | -05:00 | EST | Standard time |
| 1987-04-05 03:00 | -04:00 | EDT | Daylight saving time |
| 1987-10-25 01:00 | -05:00 | EST | Standard time |
| 1988-04-03 03:00 | -04:00 | EDT | Daylight saving time |
| 1988-10-30 01:00 | -05:00 | EST | Standard time |
| 1989-04-02 03:00 | -04:00 | EDT | Daylight saving time |
| 1989-10-29 01:00 | -05:00 | EST | Standard time |
| 1990-04-01 03:00 | -04:00 | EDT | Daylight saving time |
| 1990-10-28 01:00 | -05:00 | EST | Standard time |
| 1991-04-07 03:00 | -04:00 | EDT | Daylight saving time |
| 1991-10-27 01:00 | -05:00 | EST | Standard time |
| 1992-04-05 03:00 | -04:00 | EDT | Daylight saving time |
| 1992-10-25 01:00 | -05:00 | EST | Standard time |
| 1993-04-04 03:00 | -04:00 | EDT | Daylight saving time |
| 1993-10-31 01:00 | -05:00 | EST | Standard time |
| 1994-04-03 03:00 | -04:00 | EDT | Daylight saving time |
| 1994-10-30 01:00 | -05:00 | EST | Standard time |
| 1995-04-02 03:00 | -04:00 | EDT | Daylight saving time |
| 1995-10-29 01:00 | -05:00 | EST | Standard time |
| 1996-04-07 03:00 | -04:00 | EDT | Daylight saving time |
| 1996-10-27 01:00 | -05:00 | EST | Standard time |
| 1997-04-06 03:00 | -04:00 | EDT | Daylight saving time |
| 1997-10-26 01:00 | -05:00 | EST | Standard time |
| 1998-04-05 03:00 | -04:00 | EDT | Daylight saving time |
| 1998-10-25 01:00 | -05:00 | EST | Standard time |
| 1999-04-04 03:00 | -04:00 | EDT | Daylight saving time |
| 1999-10-31 01:00 | -05:00 | EST | Standard time |
| 2000-04-02 03:00 | -04:00 | EDT | Daylight saving time |
| 2000-10-29 01:00 | -05:00 | EST | Standard time |
| 2001-04-01 03:00 | -04:00 | EDT | Daylight saving time |
| 2001-10-28 01:00 | -05:00 | EST | Standard time |
| 2002-04-07 03:00 | -04:00 | EDT | Daylight saving time |
| 2002-10-27 01:00 | -05:00 | EST | Standard time |
| 2003-04-06 03:00 | -04:00 | EDT | Daylight saving time |
| 2003-10-26 01:00 | -05:00 | EST | Standard time |
| 2004-04-04 03:00 | -04:00 | EDT | Daylight saving time |
| 2004-10-31 01:00 | -05:00 | EST | Standard time |
| 2005-04-03 03:00 | -04:00 | EDT | Daylight saving time |
| 2005-10-30 01:00 | -05:00 | EST | Standard time |
| 2006-04-02 03:00 | -04:00 | EDT | Daylight saving time |
| 2006-10-29 01:00 | -05:00 | EST | Standard time |
| 2007-03-11 03:00 | -04:00 | EDT | Daylight saving time |
| 2007-11-04 01:00 | -05:00 | EST | Standard time |
| 2008-03-09 03:00 | -04:00 | EDT | Daylight saving time |
| 2008-11-02 01:00 | -05:00 | EST | Standard time |
| 2009-03-08 03:00 | -04:00 | EDT | Daylight saving time |
| 2009-11-01 01:00 | -05:00 | EST | Standard time |
| 2010-03-14 03:00 | -04:00 | EDT | Daylight saving time |
| 2010-11-07 01:00 | -05:00 | EST | Standard time |
| 2011-03-13 03:00 | -04:00 | EDT | Daylight saving time |
| 2011-11-06 01:00 | -05:00 | EST | Standard time |
| 2012-03-11 03:00 | -04:00 | EDT | Daylight saving time |
| 2012-11-04 01:00 | -05:00 | EST | Standard time |
| 2013-03-10 03:00 | -04:00 | EDT | Daylight saving time |
| 2013-11-03 01:00 | -05:00 | EST | Standard time |
| 2014-03-09 03:00 | -04:00 | EDT | Daylight saving time |
| 2014-11-02 01:00 | -05:00 | EST | Standard time |
| 2015-03-08 03:00 | -04:00 | EDT | Daylight saving time |
| 2015-11-01 01:00 | -05:00 | EST | Standard time |
| 2016-03-13 03:00 | -04:00 | EDT | Daylight saving time |
| 2016-11-06 01:00 | -05:00 | EST | Standard time |
| 2017-03-12 03:00 | -04:00 | EDT | Daylight saving time |
| 2017-11-05 01:00 | -05:00 | EST | Standard time |
| 2018-03-11 03:00 | -04:00 | EDT | Daylight saving time |
| 2018-11-04 01:00 | -05:00 | EST | Standard time |
| 2019-03-10 03:00 | -04:00 | EDT | Daylight saving time |
| 2019-11-03 01:00 | -05:00 | EST | Standard time |
| 2020-03-08 03:00 | -04:00 | EDT | Daylight saving time |
| 2020-11-01 01:00 | -05:00 | EST | Standard time |
| 2021-03-14 03:00 | -04:00 | EDT | Daylight saving time |
| 2021-11-07 01:00 | -05:00 | EST | Standard time |
| 2022-03-13 03:00 | -04:00 | EDT | Daylight saving time |
| 2022-11-06 01:00 | -05:00 | EST | Standard time |
| 2023-03-12 03:00 | -04:00 | EDT | Daylight saving time |
| 2023-11-05 01:00 | -05:00 | EST | Standard time |
| 2024-03-10 03:00 | -04:00 | EDT | Daylight saving time |
| 2024-11-03 01:00 | -05:00 | EST | Standard time |
| 2025-03-09 03:00 | -04:00 | EDT | Daylight saving time |
| 2025-11-02 01:00 | -05:00 | EST | Standard time |
| 2026-03-08 03:00 | -04:00 | EDT | Daylight saving time |
| 2026-11-01 01:00 | -05:00 | EST | Standard time |
| 2027-03-14 03:00 | -04:00 | EDT | Daylight saving time |
| 2027-11-07 01:00 | -05:00 | EST | Standard time |