Daylight saving time

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A map showing countries that use daylight saving.      DST used      DST no longer used      DST never used
Diagram of a clock showing a transition from 02:00 to 03:00
Clocks are advanced by one hour during the very early morning at the beginning of DST.
Diagram of a clock showing a transition from 03:00 to 02:00
When DST ends, clocks are set back (as if to repeat one hour) during the very early morning. Specific times vary.

During the summer months, the sun stays is 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. The time during summer is called Daylight saving time (DST). In Europe it is called summer time. The time during the winter months is called "standard time".

DST helps stores that sell to people after they get off work, but it hurts 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.

The United States, Australia, the United Kingdom, Canada and many other countries have DST. In some of those countries, there are areas that do not have it. Those areas include:

Iceland, Russia, Ukraine and Belarus are countries in Europe without DST.

USA dates and UK dates[change | change source]

USA 2014 date: November 2nd (ending)

USA 2013 date: March 10

USA 2012 date: March 11

USA 2011 date: March 13

UK 2011 date: February 1

USA 2010 date: March 14

UK 2010 date: February 11

USA 2009 date: March 8

UK 2009 date: February 26

USA 2008 date: March 2

UK 2008 date: February 27

Automatic adjustment[change | change source]

Most computers, mobile phones and other devices connected to the Internet will automatically adjust their clocks for DST. Some older computers will not adjust or will adjust the time incorrectly or on the wrong date. Also, computers with more than one operating system may be incorrectly adjusted twice or more when each operating system boots.