Adjacent time zones are time zones that share a common boundary, just as adjacent countries share a common border and adjacent apartments share a common wall.
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An adjacent time zone is one that is next to or neighboring another time zone. This means that the time in the adjacent time zone is typically one hour ahead or behind the time in the neighboring time zone.
Each time zone differs by one hour from the adjacent time zone. This is to account for the Earth's rotation which causes changes in daylight and nighttime across different regions of the world.
There is usually a one-hour time difference between adjacent time zones. However, some countries have chosen to deviate from this standard by having half-hour or even 45-minute differences between their time zones.
The Central Time Zone is to the east of the Mountain Time Zone in the United States.
The Pacific Time Zone is west of the Mountain Time Zone.
The time zone to the right of the Eastern Time Zone is the Atlantic Time Zone, which is also known as Eastern Time Zone - Atlantic Standard Time (AST).