On Sat, 2003-08-02 at 13:37, David E Fox wrote:
> Hi
> 
> On a previous message I noted my issue with kde's clock having the
> wrong timezone. Still haven't sorted that out. But I noticed today that
> the system's time was wrong - still the right timezone but about 20
> minutes off PDT using the 'popcorn' service (speaking clock). 
> 
> I apparently sync to time.nrc.ca, that's the one I picked, but if
> it's the source of the bad time, maybe the time is different in
> Canada?
> 
> Back when I installed I seem to recall there was a list of available
> time servers, but I haven't seen where this list is stored post-install.


Anne has already posted the url for the servers, but I've got a
suggestion for a daemon that corrects your system clock online and off.
It's called chrony --

http://chrony.sunsite.dk/

Chrony is different in that while it checks the ntp time servers and
does correct your time, it also keeps a database of all the time checks
that it does as well as the amount by which your RTC/system clock is
off.  The real value of chrony is when you are offline; because when
chrony cannot contact ntp servers it reverts to it's database of ntp
time checks and RTC/system clock error margins, and then makes
corrections on it's own.  In other words with chrony your system becomes
accurate wether it's on or offline.

This relieves your dependence on timeservers to a great degree.  You no
longer have to be in contact with an ntp server 24/7 in order to be
reasonably accurate, as your system now has the capability to be self
correcting of it's own errors based on a database of past RTC time
errors.  After a certain time of being online, the time/error database
becomes sufficiently large that an adequate degree of time accuracy
becomes prevalent during offline times.

If you've ever studied exactly how bad computer clocks can be, you can
understand how valuable a self correcting mechanism like chrony is. 
That's not all it does, however; there's quite a few other things that
it's capable of, including detailed reports on daily average time
errors, for instance. You can also peruse it's database as it
accumulates timeserver versus system clock error data.

LX
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