MachineOfTheMonth: Setting the clock in Linux part 2Apr 23, 2000, 14:10 (2 Talkback[s])
(Other stories by Glenn Mullikin)
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"In part_1_of_Setting_the_Clock_in_Linux we saw how one could change the time or set the time and date on their computer. This is important because if the time were to get out of whack we need to fix it. But one thing we didn't talk about was "How do we know where to find the correct time?". In this article, I will attempt to address that issue using what I have learned over the last few weeks. In Part 1 we also saw how the system and hardware clocks interact to keep track of the time...."
"This method is what most of us use. We find a source of information that we trust and use it to set our system clock manually. That source could be almost anything. It could be the wall clock sitting in our room, the time we get by calling a specific phone number, or maybe there is a television channel that shows the time (including seconds). In these cases, the we can't really expect to have accurate time to the second. What we can expect is within a few minutes depending upon the source we are using. For most of us, that is not a problem. But for many of us, we want a more accurate time measure. Enter the National Institute of Standards and Technology..."
"In fact, you may already be using a clock sitting in your house that receives a radio frequency that sets that clock. That is one of the services provided by the Time and Frequency Division of NIST. These clocks never need manual setting because they update by radio waves. So if you have one of these you know you have an accurate source for the current time and it is just a matter of transferring that time to your linux system using a simple command."
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