what is it called when you turn the clocks back
Daylight saving time
title: Clock face text: Clock face A clock face, or dial, is the part of an analog clock (or watch) that displays the time through the use of a fixed-numbered dial or dials and moving hands. In its most basic form, recognized throughout the world, the periphery of the dial is numbered 1 through 12 indicating the hours in a 12-hour cycle, and a short "hour hand" makes two revolutions in a day. A long "minute hand" makes one revolution every hour. The face may also include a "second hand", which makes one revolution per minute. The term is less commonly used for the title: Balance wheel text: Balance wheel A balance wheel, or balance, is the timekeeping device used in mechanical watches and some clocks, analogous to the pendulum in a pendulum clock. It is a weighted wheel that rotates back and forth, being returned toward its center position by a spiral torsion spring, the balance spring or hairspring. It is driven by the escapement, which transforms the rotating motion of the watch gear train into impulses delivered to the balance wheel. Each swing of the wheel (called a 'tick' or 'beat') allows the gear train to advance a set amount, moving the hands forward. The balance title: Clock text: Some clocks, called 'flip clocks', have digital displays that work mechanically. The digits are painted on sheets of material which are mounted like the pages of a book. Once a minute, a page is turned over to reveal the next digit. These displays are usually easier to read in brightly lit conditions than LCDs or LEDs. Also, they do not go back to 12:00 after a power interruption. Flip clocks generally do not have electronic mechanisms. Usually, they are driven by AC-synchronous motors. Clocks with analog quadrants, with a digital component, usually minutes and hours displayed analogously and seconds displayed title: Time zone text: adopt daylight saving time (also known as "Summer Time") during part of the year. This typically involves advancing clocks by an hour near the start of spring and adjusting back in autumn ("spring forward", "fall back"). Modern DST was first proposed in 1907 and was in widespread use in 1916 as a wartime measure aimed at conserving coal. Despite controversy, many countries have used it off and on since then; details vary by location and change occasionally. Most countries around the equator do not observe daylight saving time, since the seasonal difference in sunlight is minimal. Computer operating systems include title: Time in the United States text: the first Sunday in November. Clocks will be set ahead one hour at 2 a.m. on the following start dates and set back one hour at 2 a.m. on these ending dates: In response to the Uniform Time Act of 1966, each state of the US has officially chosen to apply one of two rules over its entire territory: The Energy Policy Act of 2005 extended daylight saving time (DST) for an additional month beginning in 2007. Previous DST change dates include: There exist more than one hundred clock towers in the United States; see . Time in the United