The calibration of each country with the world standard time (UTC) rules from 25 countries at an international conference in Washington DC on 1 November 2427 , the meeting agreed to divide the world along the meridian. 24 zones, each zone is equally valuable both in the West and 15 degrees East. And is equal to one hour away from the zones adjacent to the line of 0 degrees through the town of Greenwich. And a line break (International Date Line) is a 180-degree meridian that divides the country into two parts, a deadline that local standard time faster or slower than the world standard time at Greenwich much.
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