03/28/2008 02:45 am ET Updated May 25, 2011

A Numbers Breakdown: Why We Have Daylight Savings

In my print column this week, I write about the numbers used to extend daylight-saving time until Sunday. You'll be turning your clock back this weekend, rather than last weekend, because of numbers from the 1970s, the last time daylight time was extended. These figures suggested that a later sunset can help conserve energy, by reducing the use of lights and other appliances in the evening. But these numbers form a flimsy basis for a major policy change, I argue, and there are no new numbers yet available to see if the experiment was successful.

What do you think? Should there have been more study before your clock-changing habits were themselves changed? Do the other benefits make extended daylight time worthwhile even if energy isn't saved? How does the clock change affect your energy consumption? Please let me know in the comments.

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