What Is a Time Zone?
The term time zone can be used to describe several different things, but mostly it refers to the local time of a region or a country.
Time Difference from UTC
The local time within a time zone is defined by its offset (difference) from Coordinated Universal Time (UTC), the world's time standard.
UTC time changes 1 hour forward and backward corresponding to a 1-hour difference in mean solar time for every 15 degrees east or west of the prime meridian (0° longitude) in Greenwich, London, United Kingdom. The offset is expressed as either UTC- or UTC+ and the number of hours and minutes.
Local Time Zone Names
To confuse matters more, each time zone can have different local time zone names, usually linked to the geographical name of the country or region. The time zone names may be completely different, even though the UTC offset is the same.
For instance in Miami, Florida, is 5 hours behind UTC (UTC-5) and the standard time zone is Eastern Standard Time (EST). In Havana, Cuba, the standard time zone is also UTC-5, but it's called Cuba Standard Time (CST).
References
https://www.timeanddate.com/time/time-zones.html
“Time is what we want most, but what we use worst.”
William Penn##
“For every minute you are angry you lose sixty seconds of happiness.”
Ralph Waldo Emerson##
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