Since the Earth orbits the sun elliptically and therefore a) accelerates and b) has to turn about a degree more than a full circle to bring the sun into the same position, sunrise and sunset are not symmetrical around local noon. Here in Hawaii, the sun set today at 5:45, a minute later than it was setting a few days ago. Of course, it's still rising later, too, so the total daylight will continue to shorten until the 21st. But the afternoons are getting longer!
You can generate your own sunrise and sunset tables here.