Daylight saving time changes in MIT kerberos?
jhutz at cmu.edu
Fri Oct 13 15:15:05 EDT 2006
On Friday, October 13, 2006 09:54:19 AM -0400 Danny Mayer
<mayer at ntp.isc.org> wrote:
> What are you talking about? Timezones are local display issues. When you
> go from summer time to winter time and visa versa do you see issues? All
> applications use UTC which doesn't care about timezones.
Unfortunately, this is not entirely true. Certain operating systems track
local time, rather than UTC, and thus will report incorrect UTC times to
applications if the timezone is not correct. Further, users are prone to
deciding that the time they see is wrong and "fixing" it by changing the
time rather than selecting the correct timezone. It seems not unlikely
that a good portion of users will do so in response to the upcoming
brokenness ("Oh, I know the rules changed; my computer must have done it
wrong, so I'll just set the clock now").
Of course, systems using NTP with a reliable time source should have no
problems, as long as the user does not tamper with the clock.
-- Jeffrey T. Hutzelman (N3NHS) <jhutz+ at cmu.edu>
Sr. Research Systems Programmer
School of Computer Science - Research Computing Facility
Carnegie Mellon University - Pittsburgh, PA
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