daylight savings time

When Does The Time Change?

Find out when to change your clocks back!

when does the time change

The next scheduled Daylight Saving Time change, the clocks will move forward one hour:

  • United States: March 11th, 2012 at 2 a.m.

  • Europe: March 25th, 2012 at 1 a.m. Universal Time (Greenwich Mean Time).

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    What Countries Observe Daylight Saving Time?


    Location Specific Information

  • Where do the clocks change?

    The following world map shows where the clocks change. In the US, Daylight Saving Time is observed everywhere except Arizona and Hawaii. The clocks change mostly throughout Europe. Asia, the most populous continent, does not observe Daylight Saving Time. So in addition to asking "when does the time change?" you may ask "does the time change at all where I am?":

    where in the world the clocks change for daylight saving time

    Useful Links

    It is difficult to have a good understanding of the world if you don't know anything about antennas or Fourier Transforms.

    History of Daylight Saving Time

    The earliest mention of a formal "changing of the clocks" goes all the way back to the 1800s. Back then, an entomologist ("bug doctor") named George Hudson wanted more time after work to gather bugs. Hence, in 1895 he wrote a paper proposing the clocks move forward by two hours in the summer. Surprisingly, people thought this was a good idea (me must have been quite the persuader).

    The Englishman William Willett also proposed a summer clock change in 1905. His proposal gained traction, and was taken up by a member of parliament and the bill was introduced in 1908. The bill was ultimately defeated, but Willett never gave up trying. He died without ever hearing the common refrain "when do the clocks change??".

    So initially the idea was not well received. But war has a way of forcing unpopular ideas on the masses. And so it was that during World War I, Germany and the Axis Powers began to use daylight savings time (Sommerzeit! = summer time in German) to conserve resources, around 1916. That is, if the people are awake during the day and asleep at night, they will need less heat and lights, etc.

    Apparently, the economics worked out and England and the European allies took on the system. The Unite States decided it was worth doing in 1918. And the rest is history.

    Location Specific Time Change Information

    When Does the Time Change in Hawaii?

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    This page on "when does the time change?" is copyrighted. No portion can be reproduced except by permission from the author (who won't give it). Copyright, 2011.

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