An Expert Has The Answers To Daylight Saving Time Conundrum

NOEL KING, HOST:
All right. You know how we set our clocks ahead in March, springing forward, as they say? But does that mean we started or ended daylight saving time? Let's ask an expert.
(SOUNDBITE OF FILM, "BACK TO THE FUTURE, PART II")
CHRISTOPHER LLOYD: (As Doc Brown) The time continuum has been disrupted, resulting in this alternate reality.
STEVE INSKEEP, HOST:
Wait. Wait. Wait - not that expert, not Doc Brown from "Back To The Future." Let's go to a real-life time machine keeper.
DEMETRIOS MATSAKIS: My name is Dr. Demetrios Matsakis. I worked for 40 years at the U.S. Naval Observatory, most of that in timekeeping.

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