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The Canadian territories that observe Central Time are Kivalliq Region, Nunavut, Ontario, and parts of Qikiqtaaluk Region Saskathchewan. There are also states that generally observe Central time, but have areas that follow Mountain Time: Kansas, Nebraska, North Dakota, South Dakota, and Texas. In the United States, the states that generally observe Central Time are Alabama, Arkansas, Illinois, Iowa, Louisiana, Minnesota, Mississippi, Missouri, Oklahoma, and Wisconsin. In Mexico, the functioning time zone is called Tiempo del Centro and is ahead of the Pacific Time Zone by two hours. It is referred to as Central Time in the United States as well as Canada, often shortened to ‘Central’ in casual conversation. It returns to EST on the first Sunday of November from 02:00 EDT to 01:00 EST. As of 2007, CST changes to CDT on the second Sunday of March at 02:00 (EST) to 3:00 (EDT). The Central Time Zone is calculated by subtracting six hours from the Coordinated Universal Time (abbreviated as UTC), or five hours if observing Daylight Savings Time (Central Daylight Time or CDT). North America’s Central Standard Time Zone is observed by areas of the United States, Canada, and Mexico. There are differences between the observance of Central (CT) and Eastern Time (ET). This is especially true when it comes to those that are under the Central and Eastern Time Zones. One thing that is curious about time zones is how certain locations observe more than one, depending on how close they are to the geographic borders. Most people aren’t even aware of the fact that certain parts of Canada follow the established standards with regard to the time zones in the USA. Regardless which National Weather Service weather map, radar, or satellite picture you view, be sure to first check the time of the image as it will be reported in 24-hour "Z" time.The time zones observed in North America can be a tricky thing to grasp. The following tables show z-times for each time zone in the United States and U.S. For example, 00Z in the Central STANDARD Time is at 6:00 p.m. Z-time does not change with the change for daylight saving time but the local time will change. 00Z for the United States begins in the evening local time. The 24-hour clock (Z-time) begins at midnight (00Z) at this prime meridian. Moving east across the International Date Line means subtracting 24 hours from the clock thereby reversing one day on the calendar. This means you advance the clock 24 hours in essence you advance one day on the calendar. Moving west across the International Date Line one moves from the -12 UTC time zone to the +12 UTC time zone. At the meeting of the -12 and +12 time zones is the International Date Line. Time zone offsets are identified as -12 UTC through 0 to +12 UTC with the minus values signifying time "before" or ahead of prime meridian (which is the Western Hemisphere). However, today the individual zone boundaries are no longer straight, nor are they always continuous, as they have been modified for convenience and to satisfy the desires of sovereign nations. With the 360° daily rotation of the earth, the sun is moving 15° each hour which leads to the formation of 24 time zones. Today, one can visit the Royal Observatory and straddle this 0° meridian with one foot in each hemisphere. This 0° meridian divides the Eastern from the Western Hemisphere. This was for both for longitude and timekeeping. settled the matter where it was agreed to establish a single "prime" meridian (0° longitude), passing through Greenwich. In 1884, a conference in Washington, D.C.