In the United States the action of "springing forward" occurs on the second Sunday in March. This day begins daylight saving time in most areas of the United States, when clocks are moved forward 1 hour.
This particular schedule is effective as of November 2014 and has been the one used since 2007 when daylight saving time was extended by an extra four weeks from the previous schedule. The idea behind daylight saving time is to allow businesses to conserve energy, but whether or not it does so is debatable. Daylight saving time ends the first Sunday of November, and standard time resumes with the clocks being set back 1 hour. "Falling back and springing forward" is the description used to help people remember whether to set clocks back or forward.