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ChatGPT
Aug 3
A time zone is a region of the Earth that has the same standard time. Time zones are used to coordinate time across different regions of the world, as the Earth is divided into 24 time zones, each one representing a different hour of the day. Time zones are typically based on the Earth's rotation and are used to help people schedule events, travel, and communicate across different regions.
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Google Gemini AI
Aug 3
Time zone refers to a region of the Earth which has a uniform standard time for legal, commercial and social purposes.
Earth is divided into 24 imaginary lines of longitude, each of 15 degree, running north-south, are called time zone meridians. The prime meridian at 0 degree longitude passes through Greenwich, England. Standard time is different in different time zones. Local standard time at any place is governed by the longitude of that place from the standard meridian of its time zone. The standard meridian of the time zone is that longitude on which the time is based.
Time zones and time difference
There are 24 time zones around the world, each covering 15 degrees of longitude. As the Earth rotates from west to east, the sun rises and sets at different times in different parts of the world. This is why there is a time difference between different time zones.
For example, when it is noon in London (GMT+0), it is 7:00 AM in New York (EST) and 10:00 PM in Tokyo (JST).
Daylight Saving Time
Daylight Saving Time (DST) is a seasonal change in the standard time of a country or region, typically by advancing it by one hour during the summer months to make better use of daylight.
DST is used in many countries around the world, typically from March or April to October or November. The specific dates for DST vary from country to country.
Coordinated Universal Time (UTC)
Coordinated Universal Time (UTC) is the primary time standard by which the world regulates clocks and time. It is the basis for civil time today, and is now used by almost all countries as their legal time.
UTC is based on the mean solar time at the prime meridian (0° longitude), which is located in Greenwich, England. UTC does not observe Daylight Saving Time.
Earth is divided into 24 imaginary lines of longitude, each of 15 degree, running north-south, are called time zone meridians. The prime meridian at 0 degree longitude passes through Greenwich, England. Standard time is different in different time zones. Local standard time at any place is governed by the longitude of that place from the standard meridian of its time zone. The standard meridian of the time zone is that longitude on which the time is based.
Time zones and time difference
There are 24 time zones around the world, each covering 15 degrees of longitude. As the Earth rotates from west to east, the sun rises and sets at different times in different parts of the world. This is why there is a time difference between different time zones.
For example, when it is noon in London (GMT+0), it is 7:00 AM in New York (EST) and 10:00 PM in Tokyo (JST).
Daylight Saving Time
Daylight Saving Time (DST) is a seasonal change in the standard time of a country or region, typically by advancing it by one hour during the summer months to make better use of daylight.
DST is used in many countries around the world, typically from March or April to October or November. The specific dates for DST vary from country to country.
Coordinated Universal Time (UTC)
Coordinated Universal Time (UTC) is the primary time standard by which the world regulates clocks and time. It is the basis for civil time today, and is now used by almost all countries as their legal time.
UTC is based on the mean solar time at the prime meridian (0° longitude), which is located in Greenwich, England. UTC does not observe Daylight Saving Time.
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