![]() Because some countries, islands and states do not want to be divided into several zones, the zones' boundaries tend to wander considerably from straight north-south lines. The map updates automatically as clock changes occur and shows the accuracy of the time zone data. The international dateline was drawn to generally follow the 180 meridian in the Pacific Ocean. Search for any city in the world and see its current local time, time zone, DST status and more on a map. The 24 standard meridians, every 15 east and west of 0 at Greenwich, England, were designated the centers of the zones. C., applied the same procedure to zones all around the world. In the U.S., there are a total of 9 time zones used. As a general rule of thumb, a change of 15° of longitude should result in a time difference of 1 hour. Many countries have more than one time zone. On November 1, 1884, the International Meridian Conference in Washington, D. The following map displays the standard time zones across the world. At noon, on November 18, 1883, telegraph lines transmitted GMT time to major cities where authorities adjusted their clocks to their zone's proper time. Find the current time and time zone of any city or country around the world with this interactive map. That year, the United States was divided into four time zones roughly centered on the 75th, 90th, 105th, and 120th meridians. Until 1883 most railway companies relied on some 100 different, but consistent, time zones. The problem of keeping track of over 300 local times was overcome by establishing railroad time zones. Until the 1860s most cities relied upon their own local “sun” time, but this time changed by approximately one minute for every 12 miles traveled east or west. Time zones did not become necessary in the United States until trains made it possible to travel hundreds of miles in a day. Source: National Institute of Standards and Technology Physics Laboratory
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