The United States covers nine time zones. From east to west they are Atlantic Standard Time (AST), Eastern Standard Time (EST), Central Standard Time (CST), Mountain Standard Time (MST), Pacific Standard Time (PST), Alaskan Standard Time (AKST), Hawaii-Aleutian Standard Time (HST), Samoa standard time and Chamorro Standard Time.
The four standard time zones for the Continental U.S. are:
| Time Zone | Major Cities |
| Eastern Standard Time (EST) --- 6PM | Boston, New York, Philadelphia, Pittsburgh, Baltimore, Washington, D.C., Atlanta, Miami, Cleveland, Louisville, Columbus, Cincinnati, Detroit |
| Central Standard Time (CST) --- 5PM | Memphis, New Orleans, Houston, Austin, San Antonio, Dallas, Chicago, St. Louis, Milwaukee, Minneapolis |
| Mountain Standard Time (MST) --- 4PM | Denver, Albuquerque, Phoenix, Salt Lake City, El Paso, Boise, Rapid City, Tucson, |
| Pacific Standard Time (PST) --- 3PM | Seattle, Portland, San Francisco, San Jose, Los Angeles, San Diego, Oakland, Las Vegas |
This is a map of U.S. Time Zones:
Most of U.S. observe daylight saving time which begins at 2 a.m. on the Second Sunday in March, and lasts until 2 a.m. on the First Sunday of November. An easier way to remember how to adjust your clock is: "Spring Forward, Fall Back" - In March, turn your clocks forward one hour. In November, turn clocks backward one hour.
Year |
DST Begins 2 a.m. |
DST Ends 2 a.m. |
2018 |
March 11 |
November 4 |
2019 |
March 10 |
November 3 |
2020 |
March 8 |
November 1 |
2021 |
March 14 |
November 7 |
2022 |
March 13 |
November 6 |
2023 |
March 12 |
November 5 |
2024 |
March 10 |
November 3 |
2025 |
March 9 |
November 2 |