Look at your phone and a friends phone and you'll probably find that they show a time a few seconds off. I believe towers do attempt to synchronize, but they don't seem to do it well. Cell phones do get their time from towers, but towers maintain their own clocks and may deviate by as much as 1-2 minutes at times from the network average. The cellphone networks are not as highly synchronized as people seem to think. Don't worry, the GPS system broadcasts the current offset. I doubt times in the nanoseconds will matter in your application, but that 14 seconds is a pretty big difference that you'll need to compensate for if you choose to receive GPS time. But, over time two differences have appeared: (1) the GPS time does not account for leap-seconds while the NIST/USNO time does, so GPS time is now 14 seconds behind, and (2) because time synchronization between GPS satellites is ad-hoc, it can acceptably deviate from the NIST/USNO time by severall hundred ns. For example, the GPS system was initially synchronized to the USNO Reference Time, provided by the US Navy, which is standard amongst the armed forces and precisely synchronized with the NIST time. Other highly time-synchronized systems, though, might operate to a different standard. Your exact reference depends on your exact application the NIST-ITS provides a time that is official for US Government purposes and accepted as the standard by most industries. On a more technical level, the NTP system should ensure a time accuracy well below one second (theoretical accuracy is apparently in the nanosecond range, but that requires a large pool of time sources). I use (mirror provided by the LDS Business College) on the west coast and (Columbia County, GA government) on the east coast, because both are official NIST-ITS mirrors but are fairly obscure so load is low (= fast and reliable sync). Instead, use one of the other official servers listed at the NIST-ITS webpage. is the best-known NIST-ITS server, but it's recommended against because high load makes it unreliable. You can synchronize to the NIST directly via the NIST Internet Time Service.
#Work clock tard wrong windows#
Windows 7, by default, will synchronize it's time to (right click your clock, press Adjust Date/Time, and switch to the Internet Time tab to see this), which in turn synchronizes with the NIST (National Institute of Standards and Technology), maintainers of the "official time" in the US.
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