Re: daylight savings time
On Wed, Mar 14, 2007 at 08:38:27 -0500, chris dunn wrote:
[...]
> I'm living in the Turks & Caicos Islands (in the sunny Caribbean).
>
> Running Debian Testing which is kept up to date.
>
> "zdump -v America/Grand_Turk | grep 2007" gives me :
>
> 117:America/Grand_Turk Sun Apr 1 04:59:59 2007 UTC = Sat Mar 31
> 23:59:59 2007 EST isdst=0 gmtoff=-18000
> 118:America/Grand_Turk Sun Apr 1 05:00:00 2007 UTC = Sun Apr 1
> 01:00:00 2007 EDT isdst=1 gmtoff=-14400
> 119:America/Grand_Turk Sun Oct 28 03:59:59 2007 UTC = Sat Oct 27
> 23:59:59 2007 EDT isdst=1 gmtoff=-14400
> 120:America/Grand_Turk Sun Oct 28 04:00:00 2007 UTC = Sat Oct 27
> 23:00:00 2007 EST isdst=0 gmtoff=-18000
>
> all of which is patently untrue, in that the TCI Government in their
> infinite wisdom have chosen to follow the absurd (for us) US adjustments
> to the DST dates.
>
> Presumably this occurs because the Grand_Turk information
> in /usr/share/zoneinfo has not been correctly updated. How can I go
> about getting this right?
I think the relevant utility is "zic", the zone information compiler. I
have never had to do this myself, so I am not sure if it works like
that, but I would hope that you can redirect the output of zdump to a
file, edit it to have the correct dates for the change to/from DST and
then run it through zic to get a corrected time zone file. You probably
have to study the manpages a bit to find the necessary options for the
command. If you have the new file, make sure you copy it to
/etc/localtime so that it will become effective. (AFAIK, when you set up
your timezone with tzconfig then the corresponding file from
/usr/share/zoneinfo is also copied to /etc/localtime without further
changes.)
> Thanks to all the participants in the thread. I've been wrestling with
> this problem since the recent time change, and have not been able to
> resolve the issue up to now, but I now see the source of the problem.
>
> Chris Dunn
--
Regards,
Florian
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