Time Zone History

Coyhaique time zone history

On standard time, clocks at Coyhaique run 1 hour 48 minutes ahead of local mean solar time, the fifth-largest gap of the 233 zones whose clocks run ahead of the sun. On March 20, 2025 the summer offset, UTC−3, became permanent standard time; the clocks did not move that day. Daylight saving time was used in 56 years since 1970, last in 2025; under the current rules the clocks no longer change.

UTC−3

Standard time is UTC−3 all year under the current rules.

Covers: Aysén Region · tz database name America/Coyhaique

Convert a time from Coyhaique

Summer time in 56 of 57 years since 1970

UTC−5, UTC−4:48:16, UTC−4:42:45: behind today’s standard timeUTC−4: 1 hour behind today’s standard timeUTC−3: today’s standard timeUTC−5, UTC−4:48:16, UTC−4:42:45:behind today’s standard timeUTC−4: 1 hour behind today’sstandard timeUTC−3: today’s standard time

How to read this chart

Before 1970

18801900192019401960188019201960
JanFebMarAprMayJunJulAugSepOctNovDec1970198019902000201020202028JFMAMJJASOND1970198019902000201020202028

Standard time changes

DateChangeNew standard timeClock label
Before 1970
January 1, 1890Local mean time (UTC−4:48:16) replacedUTC−4:42:45SMT
January 10, 1910Standard time back 17 minutesUTC−5numeric only
July 1, 1916Standard time forward 17 minutesUTC−4:42:45SMT
September 10, 1918Standard time forward 43 minutesUTC−4numeric only
July 1, 1919Standard time back 43 minutesUTC−4:42:45SMT
September 1, 1927Standard time back 17 minutesUTC−5numeric only
September 1, 1932Standard time forward 1 hourUTC−4numeric only
June 1, 1942Standard time back 1 hourUTC−5numeric only
August 1, 1942Standard time forward 1 hourUTC−4numeric only
August 29, 1946Summer offset kept as standard time; clocks did not moveUTC−5numeric only
May 21, 1947Standard time forward 1 hourUTC−4numeric only
Since 1970
March 20, 2025Summer offset kept as standard time; clocks did not moveUTC−3numeric only

Daylight saving periods

YearsClocks go forwardClocks go backShift and labels
Before 1970
1928–19311 September, 00:001 April, 00:001 hour
1932not that yearApril 11 hour
1947not that yearApril 11 hour
1968November 3not that year1 hour
1969November 23March 301 hour
Since 1970
1970October 11March 291 hour
1971October 10March 141 hour
1972October 15March 121 hour
1973September 30March 111 hour
1974–1977second Sunday in October, 00:00second Sunday in March, 00:001 hour
1978October 15March 121 hour
1979–1980second Sunday in October, 00:00second Sunday in March, 00:001 hour
1981October 11March 151 hour
1982–1986second Sunday in October, 00:00second Sunday in March, 00:001 hour
1987October 11April 121 hour
1988October 9March 131 hour
1989October 15March 121 hour
1990September 16March 111 hour
1991October 13March 101 hour
1992October 11March 151 hour
1993–1994second Sunday in October, 00:00second Sunday in March, 00:001 hour
1995October 15March 121 hour
1996October 13March 101 hour
1997October 12March 301 hour
1998September 27March 151 hour
1999October 10April 41 hour
2000October 15March 121 hour
2001–2005second Sunday in October, 00:00second Sunday in March, 00:001 hour
2006October 15March 121 hour
2007October 14March 111 hour
2008October 12March 301 hour
2009October 11March 151 hour
2010October 10April 41 hour
2011August 21May 81 hour
2012September 2April 291 hour
2013September 8April 281 hour
2014September 7April 271 hour
2016August 14May 151 hour
2017–2018second Sunday in August, 00:00second Sunday in May, 00:001 hour
2019September 8April 71 hour
2020–2021first Sunday in September, 00:00first Sunday in April, 00:001 hour
2022September 11April 31 hour
2023September 3April 21 hour
2024September 8April 71 hour

Also on UTC−3

Rio Gallegos (Argentina), Punta Arenas (Chile), Ushuaia (Argentina), Falkland Islands, Mendoza (Argentina), San Luis (Argentina), San Juan (Argentina), Buenos Aires (Argentina), Cordoba (Argentina) and Uruguay (nearest first; 19 more on the list of offsets).

Clocks next door since 1970

  • Rio Gallegos (Argentina) (706 km): usually 1 hour ahead; different on 9,835 days in 1970–2026; same time today.
  • Punta Arenas (847 km): same time except 1,113 days in 2017–2024.
  • Ushuaia (Argentina) (1,061 km): usually 1 hour ahead; different on 9,837 days in 1970–2026; same time today.
  • Falkland Islands (1,244 km): same time except 6,268 days in 1970–2014 and 2016–2024.
  • Santiago (1,353 km): same time except 308 days in 2025 and 2026; 1 hour behind today.

How it compares

Clocks have been changed 109 times since 1970, the most of the 30 zones on UTC−3 standard time.

Clocks were first moved for daylight saving in 1927, tied second-earliest start among the 27 zones on UTC−3 standard time that ever used daylight saving time.