Why Do We Have Daylight Saving Time?

Why do we have daylight saving time? And why are days longer in summer and shorter in winter? Daylight saving time is really just a trick. At least, so says Michael Downing, author of Spring Forward: The Annual Madness of Daylight Saving Time. He's our guest in this episode and he explains the reasons behind this semi-annual ritual of moving the clocks forward and back.