Eventually the rest of the world began to use this system, shaping the time zones we know today. World Time Zones by Country List, UTC (GMT) Standard, Worldwide List Time Zone names, codes and abbreviations for Standard Time and Daylight Saving Time (DST) around the world. Other countries created their own standard times and, in the late 1880s, the International Meridian Conference proposed a standardised 24-hour day, starting off at midnight GMT. However, in 1855, the Royal Greenwich Observatory started transmitting time signals and in 1880, the Greenwich Mean Time (GMT) became the country’s official standard time. In 1847, British railway companies began to standardize the time they were using by providing their staff with portable chronometers, resulting in what became known as ‘Railway Time’. DST is observed in some of this time zone. What Is Central Standard Time Central Standard Time (CST) is the second easternmost time zone in the United States and is also used in Canada. This time zone is in use during standard time in: North America, Central America. Johnston Atoll As standard time (Northern Hemisphere winter) North America. Central Standard Time (CST) is 6 hours behind Coordinated Universal Time (UTC). United States (HawaiiAleutian Time Zone) Hawaii United States Minor Outlying Islands. It is observed in the ACT, COT, CST, ECT, EST, PET during standard time, and in the CDT, EASST during the other months (Daylight saving time). UTC10:00 Time zone: World map with the time zone highlighted. A better system was required to enable an efficient operation of railways and new telecommunication systems. UTC-05 is a time offset that subtracts 5 hours from Coordinated Universal Time (UTC). Since the time calculations were based on the position of the sun, they could vary by four minutes for each degree of longitude. In the nineteenth century, when mechanical clocks began to become popular, time was calculated locally. How to use our map of world time zones You may see the offset to UTC (Universal coordinated time) at the bottom of the map. Time has traditionally been measured according to the position of the sun in the sky, which is different depending on where you are in the world.
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