In cities like New York and Washington D.C., which follow Eastern Time (UTC -5) during standard time (or UTC -4 during daylight saving time), the time is 5 hours behind UTC.<br> In Chicago, following Central Time (UTC -6) during standard time (or UTC -5 during daylight saving), the time is one hour behind Eastern Time.<br> In Denver, following Mountain Time (UTC -7) during standard time (or UTC -6 during daylight saving), the time is two hours behind Eastern Time.<br> On the West Coast, including cities like Los Angeles and San Francisco, Pacific Time (UTC -8) applies during standard time (or UTC -7 during daylight saving), making it three hours behind Eastern Time.<br> Alaska Time (UTC -9) and Hawaii-Aleutian Time (UTC -10) further stretch across western parts of the U.S., with Hawaii being the furthest behind UTC.

The United States officially has six time zones: Eastern Time Zone, Central Time Zone, Mountain Time Zone, Pacific Time Zone, Alaska Time Zone, and Hawaii-Aleutian Time Zone.

Yes, most parts of the United States observe Daylight Saving Time (DST), except for certain regions like Hawaii and most of Arizona.