When the clocks change for Daylight Saving Time and why we do it at all

The clocks on our smartphones do something bizarre twice a year: One day in the spring, they jump ahead an hour, and our alarms go off an hour sooner. We wake up bleary-eyed and confused until we remember what just happened.

Afterward, "Daylight Saving Time" becomes the norm for about eight months (And yes, it's called...