Time Zone History

Santiago time zone history

On standard time, clocks at Santiago run 43 minutes ahead of local mean solar time, the largest gap of the 14 zones on UTC−4 standard time whose clocks run ahead of the sun. Clocks have been changed 112 times since 1970, the most of the 41 zones in South America.

UTC−4

Standard time is UTC−4; clocks go forward to UTC−3 on the first Sunday in September and back on the first Sunday in April.

Covers: Chile (most areas) · tz database name America/Santiago

Convert a time from Santiago

Summer time in every year since 1970

UTC−5: 1 hour behind today’s standard timeUTC−4:42:45: 43 minutes behind today’s standard timeUTC−4: today’s standard timeUTC−3: 1 hour ahead of today’s standard timeUTC−5: 1 hour behind today’sstandard timeUTC−4:42:45: 43 minutes behindtoday’s standard timeUTC−4: today’s standard timeUTC−3: 1 hour ahead of today’sstandard 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−4:42:45) 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, 1946Standard time back 1 hourUTC−5numeric only
May 21, 1947Standard time forward 1 hourUTC−4numeric 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
1946July 15not that year1 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
2025–2028first Sunday in September, 00:00first Sunday in April, 00:001 hour
2029September 2April 81 hour
2030September 8April 71 hour
2031–2034first Sunday in September, 00:00first Sunday in April, 00:001 hour
2035September 2April 81 hour
2036–2037first Sunday in September, 00:00first Sunday in April, 00:001 hour

Clock changes in 2026, 2027 and 2028

The clocks go forward 1 hour on September 6, 2026, September 5, 2027 and September 3, 2028 at 00:00 and back 1 hour on April 5, 2026, April 4, 2027 and April 2, 2028 at 00:00, local time.

Also on UTC−4

Bolivia, Campo Grande (Brazil), Cuiabá (Brazil), Porto Velho (Brazil), Manaus (Brazil), Boa Vista (Brazil), Guyana, Venezuela, Barbados and Martinique (nearest first; 8 more on the list of offsets).

Clocks next door since 1970

  • Mendoza (Argentina) (183 km): same time except 10,423 days in 1970–2014 and 2016–2026; 1 hour ahead today.
  • San Juan (Argentina) (293 km): usually 1 hour ahead; different on 9,623 days in 1970–2026.
  • San Luis (Argentina) (401 km): same time except 10,245 days in 1970–2014 and 2016–2026; 1 hour ahead today.
  • La Rioja (Argentina) (575 km): usually 1 hour ahead; different on 9,587 days in 1970–2026.
  • Cordoba (Argentina) (650 km): usually 1 hour ahead; different on 9,578 days in 1970–2026.

How it compares

Standard time has stayed at UTC−4 since 1947.