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 ...

America’s time zones are divided by hard borders. Whether you live in West Quoddy Head, Maine (the easternmost point in the Eastern time zone), or Ontonagon County in Michigan (the westernmost ...

The time-zone quandary is yet another stumbling block in U.N.-brokered peace talks between Greek and Turkish Cypriots that recently resumed after both sides rejected a reunification plan in 2004.

If you look at the map of time zones in the U.S., many of them run along state borders. We just happen to live in one of the 15 states split into multiple time zones.