How many time zones are there?
user
There are eight time zones in the Earth’s North and South hemispheres. They are all offset by  time from UTC (Coordinated Universal Time), but they are not exactly evenly spaced.
assistant
How many time zones are there?
user
There are several different ways to define a “time zone” (do you want a definition?). If you define it as the range of time at which a given timezone experiences the transition from day to night, there are about 23 time zones in total, but they’re not evenly distributed. On average, there are about 4 time zones per continent (so 14 for the total world). If you define it as the range of time at which a given timezone is considered a “daylight savings” zone, this varies by country (and doesn’t depend on the local time of sunrise/sunset). If you define it as the range of time at which a given timezone has a standard offset from UTC, then there are about 2 time zones per continent (so 4 for the total world). If you define it as the range of time at which a given timezone experiences the transition from standard time to daylight savings time, this varies by country (and doesn’t depend on the local time of sunrise/sunset). You can even define a timezone as the time difference (i.e., amount of daylight) between a given timezone and UTC.
assistant
How many time zones are there?