On a seemingly-arbitrary Sunday each spring and fall, we all dutifully change our clocks by an hour, often griping about the hassle. Sometimes we do this only after missing an appointment, making the transition even worse. Even in a modern world where electronic devices update time for us, the shift of an hour messes with sleep patterns and daily routines – anyone with kids can tell you babies don't respect Daylight Saving Time (DST). Why even bother with the shift anymore? What's the point of moving an hour of sunlight into the evening?
In a new paper forthcoming in The Review of Economics and Statistics, we find that shifting daylight from the morning to the early evening has pretty hefty returns for public safety. When DST begins in the spring, robbery rates for the entire day fall an average of 7 percent, with a much larger 27 percent drop during the evening hour that gained some extra sunlight.