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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. Nearly all international time is kept using Coordinated Universal Time (UTC) and a twenty four hour clock. 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. Since UTC and GMT currently have equivalent time zones, you can call someone during your normal hours and it will be the same time in GMT as it is in UTC. 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. Though it has now been replaced by Coordinated Universal Time (UTC), GMT is still. 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. Today, one can visit the Royal Observatory and straddle this 0° meridian with one foot in each hemisphere. From 1884 until 1972, GMT was the international standard of civil time. This 0° meridian divides the Eastern from the Western Hemisphere. This was for both for longitude and timekeeping. UTC is used in aviation as well for both air traffic control. settled the matter where it was agreed to establish a single "prime" meridian (0° longitude), passing through Greenwich. Computers, servers, and online companies prefer UTC over GMT because the former is more precise.

Greenwich Mean Time or GMT is the official time zone used in that region, which runs through several European and African countries. Since Coordinated Universal Time or UTC is a standard, there is no time zone, territory or country that uses it for a local time. In 1884, a conference in Washington, D.C. In short, GMT is an actual time zone, whereas UTC is a time standard that is used to keep time synchronized across the world.