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The conference established the Greenwich Meridian as the prime meridian and Greenwich Mean Time (GMT) as the world's time standard. The international 24-hour time-zone system grew from this, in which all zones referred back to GMT on the prime meridian.
Keeping this in view, what was the first time zone?
UTC+14:00 is an identifier for a time offset from UTC of +14:00. This is the earliest time zone on Earth, meaning that areas in this zone are the first to see a new day, and therefore the first to celebrate a New Year.
In this regard, how did they decide time zones?
Every 15 longitudinal degrees, the time changed by an hour, thus creating 24 time zones around the world. Over the years, governments have adopted, altered or ignored Greenwich Mean Time (GMT) as they saw fit. The U.S. didn't sign its time zones into law until 1918.
United States Time Zone Map
Mountain Time | Central Time | Eastern Time |
---|---|---|
Saturday 2/1/2020 5:56 AM MST | Saturday 2/1/2020 6:56 AM CST | Saturday 2/1/2020 7:56 AM EST |