This weekend, you will undoubtedly read multiple incorrect articles whining about the change to daylight saving time. It's possible you'll also read some correct opinions, like this one from Josh Barro. Here's why the whiners are wrong. Human beings have devised a system of time in which noon occurs around the middle of the day. The sun rises no later than 8am and sets after 5pm, which allows a standard 9-5 work day during daylight hours. It's the same reason we have time zones. Changing our clocks twice a year ensures that most people don't travel to work or school in the dark, and it maximizes the amount of light after 5pm for recreation.