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America/Kentucky/Louisville

America/Kentucky/Louisville is the IANA time zone for Eastern – KY (Louisville area) in the United States.

UTC−04:00

Tue, Sep 29 UTC−4 EDT

Offsets and daylight saving time

Standard offset
UTC−05:00
Daylight offset
UTC−04:00
Rule
Daylight saving time from the second Sunday in March at 02:00 to the first Sunday in November at 02:00 (local time).

Next clock changes

  • Sunday, November 1, 2026 at 02:00: back to UTC−5 (EDT → EST)
  • Sunday, March 14, 2027 at 02:00: forward to UTC−4 (EST → EDT)

Names

Generic name
Eastern Time
Abbreviation
EST / EDT
Standard / daylight
Eastern Standard Time / Eastern Daylight Time
Aliases
America/Louisville (old ids that resolve to America/Kentucky/Louisville)

Use it in code

// JavaScript
new Intl.DateTimeFormat('en-US', { timeZone: 'America/Kentucky/Louisville' })

# Python
from zoneinfo import ZoneInfo
ZoneInfo('America/Kentucky/Louisville')

-- PostgreSQL
SELECT now() AT TIME ZONE 'America/Kentucky/Louisville';

Cities in America/Kentucky/Louisville

Offset history since 1970

  • 1970–1973: UTC−5 and UTC−4 each year
  • 1974: UTC−5
  • 1975–2026: UTC−5 and UTC−4 each year

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