Clocks are advanced by one hour during the very early morning at the beginning of DST.
When DST ends, clocks are set back (as if to repeat one hour) during the very early morning. Specific times vary.
Daylight saving time (DST) orsummer time (ST) is a time to keep duringsummer. During thesummer 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 inEurope andNorth America.
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, inCanada and theUnited 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.
Since 1971 all clocks in theEuropean Union have changed on same dates and at the same time, 06:00 GMT.[3]
European Summer Timebegins (clocks go forward) at 01:00 UTC on the last Sunday in March, andends (clocks go back) at 01:00 UTC on the last Sunday in October:
↑If the 2018 Commission proposal had been approved by the Council of Ministers, and member states opted to remain on winter time year round, the October 2022 clock change would have been the final clock change.
Permanent Summer Time has support in some northerly countries such as the UK. It was tried in the British Standard Time experiment, with Britain remaining on GMT+1 throughout the year. This took place between 27 October 1968 and 31 October 1971.
There are proposals for GMT+1 in the winter, and DST summer time (GMT+2) in the summer. In favour are most city dwellers: children do not have to come home after school in the dark, and late afternoon and early evening activities benefit. In favour also were those concerned with accidents, because both accidents and fuel consumption go down.RoSPA suggests this would reduce the number of accidents over this period as a result of the lighter evenings.[4][5][6]
Against are many farmers in northerlylatitudes, because sunrise would occur in winter at about 10:00 in the morning. However, in March 2010 theNational Farmers Union said that it was not against Single/Double Summer Time, and is in fact relatively neutral, with many farmers expressing a preference for the change.[7]
Mostmobile phones andcomputers connected to the Internet will automatically adjust their clocks for DST. Some computers will not adjust or will adjust the time incorrectly or on the wrong date. Also, computers with more than oneoperating system may be incorrectly adjusted twice or more when each operating system boots.
↑"The World Clock (extended version)". timeanddate.com. Retrieved1 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.
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