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(on the second Sunday in March and the first Sunday in November) we set our clocks forward or backward one hour.), but there are still some important items to consider.However, DST is not observed in Hawaii, American Samoa, Guam, Puerto Rico, the Virgin Islands and the state of Arizona (with the exception of the Navajo Indian Reservation, which does observe DST). However, as an official timekeeper for the United States, NIST observes all rules regarding DST when it distributes time-of-day information to the public.Daylight saving time and time zones are regulated by the U. There shouldn't be any problems if your operating system has the latest updates. Since computers rely on clocks to execute instructions and perform functions, failure to account for local time changes can lead to unintended consequences.
DST is now in effect for 238 days, or about 65% of the year, although Congress retained the right to revert to the prior law should the change prove unpopular or if energy savings are not significant.
In the United States, this has the effect of creating more sunlit hours in the evening during months when the weather is the warmest.
We advance our clocks ahead one hour at the beginning of DST, and move them back one hour ("spring forward, fall back") when we return to standard time (ST).
Also, if you live in an area where DST is not observed (Arizona, for example), you need to disable the automatic DST function on your clock.
Some clocks have the old date rule programmed in and do not use the part of the time code which designates whether or not daylight saving time is in effect. The time zone or DST ON/OFF function might need to be switched temporarily so the clock shows the correct hour for the period between the transition dates according to the old rules and the new rules.
If the clock isn't receiving the signal, click here for some tips on improving reception.