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Revision as of 22:24, 16 June 2002
Daylight saving time (also called "DST", or "Summer Time") is a system intended to "save" daylight (as opposed to wasting it by sleeping, say, while the sun shines). It does this by adjusting the official time forward during the spring and summer months, so that the active hours of work and school will better match the hours of daylight.
DST is not universally accepted; many localities do not observe it. Nevertheless, proponents claim that DST helps more than it hurts. The primary claim is that it reduces energy consumption. Opponents claim that there's not enough benefit to justify needing to adjust clocks twice per year.
The amount of the time shift varies, but one hour is the most common. The dates of the beginning and ending of DST also vary, but it commonly begins in the Northern Hemisphere at 2:00 AM on either the first Sunday in April or the last Sunday in March, and ends at 2:00 AM on the last Sunday in October. In the Southern Hemisphere, the beginning and ending dates are switched.
Links about DST, time zones, and official time:
- http://webexhibits.org/daylightsaving/
- http://www.iei.uiuc.edu/web.pages/holidays/DST.html
- http://www.timeanddate.com/time/aboutdst.html - gives DST changeover times throughout the world.
- http://www.worldtimeserver.com/
- http://sandbox.xerox.com/stewart/tzconvert.cgi
Links about changing or abolishing DST: