Those time zones are set by lines of longitude and, in some cases, split states. If you look at the map of time zones in the U.S., many of them run along state borders.

Alabama spans a wide region, but every city, from Huntsville to Mobile, shares the same official time. Here's what time zone ...

How many time zones are there in the United States? The U.S. has four standard time zones, but nine in total between Alaska, Hawaii and other territories, according to the Bureau of Transportation ...

Realignment has shaken things up for college programs everywhere, yet it has been particularly grueling in the Big Ten and ACC as power conferences spanning the four U.S. time zones.