Please clarify your question.
A time zone
standard time zone
An area where all use the same clock time is called a time zone
time zone
time zone
It is called a "time zone".A time zone is an area about 1/24th of the circumference of the Earth in width (15° of longitude) where the local time, as determined by the position of the Sun, is within the same hour, and the time in the center is used as a common standard. So each of these widths represents one of the separate 24 times on the clock (1 AM to 12 noon, 1 PM to 12 midnight). It is always some given hour somewhere in the world.(see related link)a time zone
Area code 319 is in eastern Iowa, including Cedar Rapids, Waterloo, and Burlington. It is in the Central time zone (CST in winter, CDT in summer), the same as Chicago and Dallas.
We call this area a time zone, where people within the region adhere to the same standard time. Time zones are based on longitudinal lines and help coordinate activities across different locations.
Area code 312 is located in the Central Time Zone.
Area code 905 serves part of southern Ontario, Canada, including Niagara Falls and the suburbs of Toronto. It is in the Eastern Time Zone, EST in winter and EDT in summer, the same as New York City.
Toronto, Ontario, Canada - Eastern Time Zone
North American area code +1 270 is the western tip of Kentucky. Most of area code 270 is in the Central Time Zone, including Bowling Green, Owensboro, and Paducah. A small part of area code 270 is in the Eastern Time Zone, including Elizabethtown and Radcliff.