Daylight Saving

"Daylight Savings Time" is incorrect, but is commonly used, especially in Australia, Canada, and the United States. Officially, it is Daylight Saving Time.

The US and Great Britain used DST during World War I and II and reverted to standard time during peace years. It was not until the energy crisis of the 1970s that Daylight Saving Time was made permanent in many areas.

The US Energy Policy Act of 2005 was signed into law on August 8, 2005. Among other things, the Energy Policy Act extended the Daylight Saving Time period by starting DST several weeks earlier (second Sunday in March) and ending it one week later (first Sunday in November).

- Countries and territories which do not observe DST    161, including China
- Countries and territories where at least one location observes DST    79
- Countries and territories where all locations observe DST some part of the year    68
- Countries and territories where many, but not all locations observe DST part of the year    11, including United States
- Countries and territories where at least one location observes DST all year    2

The majority, including Europe end DST on Sunday Oct 25. In the US, it ends 2am Sunday, November 1. Some other countries end it on other dates, such as: March 8, March 22, April 5, April 25, April 26, January 18, February 22, September 22, September 26, October 23, October 30, and November 8. Must be interesting for the global airlines to change the flight times almost monthly for beginning and ending DST.

On 31 October 2007 in a Press Release, Western Power researched and reported DST caused "a 0.6% increase in electricity consumption in Washington's main grid". It also stated that "The daylight saving research showed slightly less power was used on days when the temperature went below 30 degrees, and slightly more power when the temperatures went above 30 degrees."