clock changedaylight-saving time- the practice of advancing clocks during the lighter months so that evenings have more daylight and mornings have less. Typically clocks are adjusted forward one hour near the start of spring and are adjusted backward in autumn.summer timewinter time (standard time)spring forward - fall back- This term is meant to trigger your memory to set your clocks forward 1 hour in the spring at the start of DST, and 1 hour back in the fall when DST ends.gain 1 hour, lose 1 hour- The expression “lose an hour here, gain an hour there” also describes the start and end of DST.