[mythtv-users] US MythTV users: will your recordings be 1 hour off on March 11th?

Matt skd5aner at gmail.com
Sun Jan 21 05:33:13 UTC 2007

On 1/16/07, Ross Campbell <ross.campbell at gmail.com> wrote:
> For those who don't know or forgot, daylight savings time rules change
> in most parts of the US this year... DST will start 3 weeks earlier
> and end 1 week later thanks to the brilliant minds behind the Energy
> Policy act of 2005 -
> http://en.wikipedia.org/wiki/Energy_Policy_Act_of_2005
> So what?!
> Well, your NTP time sync keeps your system time correct, but your
> TIMEZONE is locally interpreted, so anyone with old/custom/unsupported
> Linux distros risks having their mythtv recordings off by ONE HOUR for
> the duration of the timezone change periods (4 weeks out of the year).
> That's probably not what you want... and the change starts March 11th
> this year - less than two months from now.
> If you run an OLD distro that doesn't have updated timezone rules, you
> may want to do some research about if there is an updated 'tzdata'
> source package you can install.
> For FC/redhat/EL distributions, 'rpm -q tzdata' will tell you the
> version installed.
> I believe anything newer than about tzdata-2005m will add the
> appropriate changes needed to ensure that your recordings don't miss a
> beat.
> You may have luck building a newer tzdata src rpm from here:
> http://rpmfind.net/linux/rpm2html/search.php?query=tzdata
> Or... you may be able to copy the tzdata binary files for US timezones
> from a newer Linux/UNIX distribution (?) - I don't know much about the
> tzdata binary format... is it compiled or endian or just a common
> binary blob?
> -Ross

Yea, I'm dealing with this at work... it's a major pain in the ____

Anyway, I did find something interesting... I run one of my frontends
on an xbox using xebian.  It's NOT updated with the new DST Timezone
info.  I suspect many other's may be in this position as well.  So, I
know that it's not a backend, so it shouldn't affect scheduling, but
the clock also slides on my xbox and when it slides more than about a
minutes, I have problems streaming from the backend for some reason.

Anyway, I'm in the process of manually updating my xbox frontend now.
Hope this gets the words out.


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