Daylight saving time

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A map showing countries that use daylight saving.      DST used      DST no longer used      DST never used

Daylight saving time (DST) is the local time adopted by many countries during summer. Typically, clocks are adjusted by moving the time forward by one hour in late winter or early spring. When DST ends in autumn, clocks are turned back to their normal time.

DST was introduced in many countries to use the extra daylight available during summer. 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 (not Queensland or Western Australia), the United Kingdom, Canada and many other countries have DST. In Europe, DST is called summer time. Iceland, Russia, Ukraine and Belarus are the few countries in Europe without DST.

USA dates and UK dates[change | edit source]

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 | edit 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.