Canada and the United States use daylight saving time on a wide scale, with only a few provinces/states, or parts of them, opting out of the practice or adopting it year-round without a twice-yearly switch.
On March 15, 2022, the United States Senate passed the Sunshine Protection Act by unanimous consent.
If passed by the House of Representatives, the law would place the United States under Daylight Time year-round.
[1] Mexico observed daylight saving time (DST; Spanish: horario de verano) nationwide from 1996 to 2022, even in its tropical regions, because of its increasing economic ties to the United States.
The rest of the country continued to follow the original schedule before abolishing DST on Sunday, 30 October 2022.
Barbados in the western Atlantic no longer observes Daylight Saving Time, like many Caribbean nations.
The last observance of a daylight saving-related time clock adjustment was between Sunday, 20 April 1980 at 02:00 and Thursday, 25 September 1980 at 02:00.
The French Caribbean islands of Guadeloupe, Martinique, Saint-Barthélemy and Saint-Martin do not observe Daylight Saving Time.
DST was re-implemented, citing energy conservation, beginning 10 April 2005 until 2 October 2005 and followed a similar period the next year.
San Luis province, which was previously in a different time zone than most of the country and which formerly observed DST, decided in April 2010 not to change its clocks back and to stay on UTC−03:00 all year round.
For each period, the executive branch of the government set the specific start and end dates for DST, i.e. there was no fixed annual schedule.
In 2011, Bolivia planned to observe DST starting September 1[10] for the first time in its history, advancing the clock an hour on a nationwide basis in order to offset their energy problems.
The schedule change was planned to take place every year between September and March, corresponding to the spring and summer of the South American country.
[11] However, the day before the scheduled change, on August 31, 2011, the national government indefinitely suspended the observation of DST due to opposition from experts in electricity, neighborhood and school leaders, and the general populace.
The duration and regional applicability of DST has varied over the years (see Portuguese Wikipedia page for details).
But on March 16, 2016, decree 253 modified the 2015 decision and restored winter time, except for the Magallanes and Chilean Antarctica Region which remains on UTC-03:00 permanently.
From February 1992 until March 1993, Colombia suffered rolling blackouts of up to 10 hours a day due to a particularly strong El Niño season, which dried the reservoirs in hydroelectric plants in a country deriving 70% of its energy output from hydroelectric sources; consequently, the government decided to use DST to help save electricity.
[18] Ecuador's President Sixto Durán Ballén imposed daylight saving time in 1992 in an energy-saving effort.
In 2024, a law proposal that would see DST being scrapped in its entirety and UTC−03:00 becoming the country's official time zone was approved by both chambers of the Congress.