Updating windows daylight savings

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DST is generally not observed near the equator, where sunrise times do not vary enough to justify it.

Some countries observe it only in some regions; for example, parts of Australia observes it, while other parts do not.

The time at which to change clocks differs across jurisdictions.

Members of the European Union conduct a coordinated shift, shifting all zones at the same instant, at Coordinated Universal Time (UTC), which means that it changes at Central European Time (CET), equivalent to Eastern European Time (EET); as a result, the time differences across European time zones remain constant.

North America shifts at but at the local time and is consequently uncoordinated - so that, for example, Mountain Time is, for one hour in the autumn, zero hours ahead of Pacific Time instead of one hour ahead and, for one hour in the spring, two hours ahead of Pacific Time instead of one hour ahead.

While the times of sunrise and sunset change at roughly equal rates as the seasons change, proponents of Daylight Saving Time argue that most people prefer a greater increase in daylight hours after the typical "nine to five" workday.

Supporters have also argued that DST decreases energy consumption by reducing the need for lighting and heating, but the actual effect on overall energy use is heavily disputed.

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