Vipin Rathor wrote:
> Hi All,
> To what I have heard is that US Daylight Savings Time (DST) is being
> extended by 4 weeks in 2007; this will affect all systems and applications
> that process dates and times. Will that affect MIT Kerberos product , in a
> way that the product will require a FIX. Or is it that MIT Kerberos totally
> depends on the native OS for the time functionality and hence the fix for
> the timezone provided by native OS will be sufficient ?
> Any anyone help me with this
>
> Thanks
> Vipin

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.

Danny
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On Friday, October 13, 2006 09:54:19 AM -0400 Danny Mayer
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)
Sr. Research Systems Programmer
School of Computer Science - Research Computing Facility
Carnegie Mellon University - Pittsburgh, PA

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Jeffrey Hutzelman wrote:
>
>
> On Friday, October 13, 2006 09:54:19 AM -0400 Danny Mayer
> 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.

And how many of those can run Kerberos? You need proper time to run
Kerberos.

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").

Users are always right!
>
> 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.
>

And if you look at my email address you will see that is where I'm from.

Danny
> -- Jeffrey T. Hutzelman (N3NHS)
> Sr. Research Systems Programmer
> School of Computer Science - Research Computing Facility
> Carnegie Mellon University - Pittsburgh, PA
>
>

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