As we all know the United States are very big. The longitude of Maine (on the east coast) is 65° 00' W and the longitude of California (on the west coast) is 120° 00' W. This means a time difference of almost 4 hours between the sun rise in the East and the West of America. Therefor it is not surprising that the United States use multiple zones. Nine to be exact. Luckily you found a website to check the time zone in specific parts of the United States.
Important cities in
has several timezones, the current time in some important cities in is shown below.