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 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. Time zones in Tennessee, including time zone names for standard time and Daylight Saving Time (DST) in 2024. 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, or one day on the calendar. Moving west across the International Date Line, means moving 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.
Within the 360° daily rotation of the Earth, the sun moves 15° each hour, which leads to the formation of 24 time zones. Today, a visitor to the Royal Observatory can straddle this 0° meridian with one foot in each hemisphere. This 0° meridian divides the Eastern from the Western Hemisphere. In 1884, a conference in Washington, D.C., settled the matter and established a single "prime" meridian (0° longitude), passing through Greenwich, for both for longitude and timekeeping. National Centers for Environmental Prediction.
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