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Daylight saving time (DST) or summer time (ST) is a time to keep during summer. During the summer months, the sun stays visible for a longer time, and sunset happens late in the day. For this reason, certain countries advance the time by one hour near the start of summer, and put it back one hour during autumn.
DST helps stores that sell to people after they get off work, and it does not hurt farmers and others whose hours are set by the sun. It cuts traffic accident rates. Sometimes it can reduce energy costs, but it can also increase them.
Most of the world's countries do not use DST, but it is common in Europe and North America.
The United States, Australia, the United Kingdom, Canada and many other countries have DST. These countries also have regions that do not have DST:
- United States: most of Arizona and Hawaii
- Australia: Queensland, Western Australia and the Northern Territory
- Canada: Saskatchewan except for a few locations with the border with Alberta and Manitoba, and the Yukon Territory
Iceland, Russia, Belarus, and some parts of Ukraine are countries in Europe without DST.
As of January 2024[update], the following places plan to start and end DST at the following times:[1][2]
| Places | DST start | DST end | Shift | |
|---|---|---|---|---|
|
Second Sunday in March at 02:00 | First Sunday in November at 02:00 | 1 hour | |
| Second Sunday in March at 00:00 | First Sunday in November at 01:00 | 1 hour | ||
|
Last Sunday in March at 01:00 [UTC] | Last Sunday in October at 01:00 [UTC] | 1 hour | |
| Last Sunday in March at 02:00 | Last Sunday in October at 03:00 | 1 hour | ||
| Last Sunday in March at 00:00 | Last Sunday in October at 00:00 | 1 hour | ||
| Friday before last Sunday in March at 02:00 | Last Sunday in October at 02:00 | 1 hour | ||
| Second Saturday after Ramadan at 02:00 | Saturday before last Sunday in October at 02:00 | 1 hour | ||
| Last Friday in April at 00:00 | Last Thursday in October at 24:00 | 1 hour | ||
|
First Saturday in September at 24:00 [UTC−04:00] | First Saturday in April at 24:00 [UTC−03:00] | 1 hour | |
| First Sunday in October at 00:00 | Fourth Sunday in March at 00:00 | 1 hour | ||
| First Sunday in October at 02:00 | First Sunday in April at 03:00 | 1 hour | ||
| First Sunday in October at 02:00 | First Sunday in April at 02:00 | 30 minutes | ||
| Last Sunday in September at 02:00 [UTC+12:00] | First Sunday in April at 02:00 [UTC+12:00] | 1 hour | ||
In the table above, the DST times show the time before being moved forward or back. The shift is how much time is added at the DST start time and subtracted at the DST end time. For example, in Canada and the United States, the local time changes from 02:00 to 03:00 when DST starts and from 02:00 to 01:00 when DST ends. If a time zone is listed (e.g., UTC−04:00), all time zones in a country move forward and backward simultaneously; otherwise, time zones change in their local time. Areas shown in the same color start and end DST within less than a week of each other.
- ↑ "The World Clock (extended version)". timeanddate.com. Retrieved 1 March 2023.. Detailed DST information about each location, current and historical, can be found under the relevant section of this website, and can be referred to for information in this article unless otherwise specified.
- ↑ "Time zone database and code". Paul Eggert.
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