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maximum time difference Earth's largest time difference: Time Zone may be used to refer to the local time of a country or a region. Time zones in the world are obtained from the UTC. If each time zone were 1 hour apart, there would be 24 time zones in the world. The clocks throughout the World are not adjusted for Daylight savings as all are under the regulation of a Coordinated Universal Time (UTC).  UTC is 0 hours which means any area on the Earth can only be ahead (+) or behind (-) the UTC. We know that there are 24 hours in a day, so we may think that the biggest time difference between two points on the earth would only be 24 hours. But, according to the standard time (UTC) which we follow, the biggest time difference is 26 hours. The reason behind this is because of the man-made imaginary International Date Line (IDL) which was agreed in 1884 at the International Meridian Conference (IMC). The IDL serves as the "line of demarcation" between two consecutive calendar