What are the different standard times?
In this regard, what is the difference between standard and daylight time?
With regard to the Coordinated Universal Time, Eastern Standard is 5 hours behind while Eastern Daylight is four hours behind. Compared with each other, Eastern Standard Time is one hour behind Eastern Daylight time.
Similarly, what are the 6 time zones in the USA?
The United States is spread across six time zones. From west to east, they are Hawaii, Alaska, Pacific, Mountain, Central, and Eastern.
"The meaning of the time zone definition" is: Some places change the date they change timezones or the amount they change by (there's a whole area of the world that changes by 30 minutes, not 1 hour). Some places opt to not change timezones. (Some states in Australia change, some don't.)