How Many Time Zones Are There
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Time zones are regions of the Earth where a uniform standard time is kept, determined according to the location’s longitude. The world is divided into 24 time zones, each one covering an area that is 15 degrees of longitude wide (15 degrees of longitude is equivalent to one hour). The time zones are numbered from UTC-12 to UTC+14.
The International Date Line is located halfway around the world from Prime Meridian (0°), or 180° east and west of Greenwich, England. It marks the transition between two consecutive calendar dates. All places to the east of the line are one day ahead of those to its west.
The time zones of the world can be further divided into Daylight Saving Time (DST) zones, each of which has its own calendar with days, hours and minutes. During the warm months of summer, many countries observe DST, shifting the clocks forward to provide additional hours of daylight in the evening. Most of the United States and Canada observe DST, while other countries may use other schedules.
So, to answer the question, “How many time zones are there?”: there are 24 time zones across the world, along with separate Daylight Saving Time zones in some countries.