1. INTRODUCTION
#Question: How many time zones does the U.S. have?
According to the National Institute of Standars and Technology, the United States has 9 official time zones.
Below you can find a list with all of them.
2. TIME ZONES IN THE UNITED STATES
- Atlantic (UTC-4).
- Eastern (UTC-5).
- Central (UTC-6).
- Mountain (UTC-7).
- Pacific (UTC-8).
- Alaska (UTC-9).
- Hawaii-Aleutian (UTC-10).
- Samoa (UTC-11).
- Chamorro (UTC+10).
(*) You can check the actual time in each zone [HERE].

Extension of the main USA time zones. (*) This map is missing the Atlantic, Chamorro y Samoa time zones.
3. MORE INFORMATION AND REFERENCES
- Nist.gov – National Institute of Standars and Technology (2020). Local Time FAQs > What are the time zones in the United States?. Avaliable [HERE].
- Time.gov – National Institute of Standars and Technology (2020). The Official U.S. time. Avaliable [HERE].
- Maproom (2018). Map with the main time zones in the US. Image retrieved from Wikimedia Commons. Avaliable [HERE].