At 2 a.m. local time Sunday, daylight saving time is ending, and it's back to standard time for most people in the United States. In 2010 iPhones had another problem in which the phones did not correctly change alarm schedules when daylight saving time ended, causing some European iPhone users to wake up late for work, while Australians were woken up early.
After this weekend you won't need to adjust your clocks again until the second Sunday in March of 2018, which will be 2 a.m. on March 11. Those regions that don't observe the time change include USA territories such as American Samoa, Guam, Puerto Rico and the Virgin Islands. For many years, DST was from the last Sunday in April until the last Sunday in October.
For morning people, that means there will be an extra hour of sunlight in the morning. However, any State can opt out of Daylight Saving Time by passing a State law. Set clocks ahead one hour.
The proposal stated: "The state of Montana rejects switching between standard time and daylight saving time and elects to remain on daylight saving time in Montana throughout the year". (He may have been horrified to learn that Britain's wartime enemy followed his recommendations before his homeland.) Weeks later, the United Kingdom followed suit and introduced "summer time". In 2013, iPhone customers experienced a daylight saving time bug. A U.S. Department of Transportation study in the 1970s concluded that total electricity savings associated with daylight saving time amounted to about 1 percent in the spring and fall months. This is also where you can find more information about timekeeping and daylight saving in the U.S.