When needed to ensure that the difference between the UTC and UT1 (GMT) readings will never exceed 0.9 second. If your PC clock is accurate to a second then the other time scales displayed above will also be accurate to within one second. Insertion of each UTC leap second is usually decided about six months in advance by the International Earth Rotation and Reference Systems Service. Wikipedia: ‘ Because the Earth's rotation speed varies in response to climatic and geological events, UTC leap seconds are irregularly spaced and unpredictable. GPS engines would then be able to apply this offset to allow an accurate UTC time to be determined. Instead of reprogramming each satellite’s internal clock with every leap second added, it was decided that an easier method would be to include the current number of leap seconds in the downloaded navigational data. The current local time in Los Angeles is 54 minutes ahead of apparent solar time. Since then, there have been 18 leap seconds introduced, such that there is now an 18 second difference between GPS time and UTC time. Sunrise, sunset, day length and solar time for Los Angeles. GPS time started on the 1st January, 1980, and was accurate to UTC at this point. The Global Positioning System (GPS) system uses GPS Time, which does not include these leap seconds. To prevent the atomic clocks running away with themselves as Earth slows down, the IERS tries to keep Coordinated Universal Time and Universal Time to within 0.9 seconds of each other. The real time keeping system is powered by a backup battery. Its time is fixed at prime meridian: 0°(zero degrees) longitude this position is the reason for its other names Z-Time and Zero Time. In order to keep Coordinated Universal Time as accurate as possible, two other time standards are used: International Atomic Time or TAI, and Universal Time also known as Solar Time. UT1 is defined by the rotation of the Earth with respect to the Sun, and does not contain any leap seconds.: 68, 232 UT1 always differs from UTC by less than a second. Coordinated Universal Time is a 24-hour time standard that is used to synchronize world clocks. A real time clock provides real time information of year, month, day, hour, minute, second and week. Why is Zulu Time Called Zulu Time Zulu time is the military name for UTC and is used primarily in aviation, at sea, and in the army. A time scale in which the seconds are not exactly equal to atomic seconds is UT1, a form of universal time. When required, leap seconds are applied either on December 31 st or June 30 th. Real time clock- It is an integrated circuit used to keep tracks of current time which is used in servers, personal computers and embedded systems like POS system or scheduling app. To keep UTC time synchronised to the Earth’s rotation, additional seconds can be added or removed to compensate for slight variations in the rotation rate of the Earth, as well as other factors. The global time standard is called Coordinated Universal Time (UTC), all national time standards around the world are based on this UTC time with the appropriate offset for their time zone.
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