On Mar 28, 2009, at 2:46 PM, Lonnie Abelbeck wrote:
>
> On Mar 28, 2009, at 2:16 PM, Philip A. Prindeville wrote:
>
>> I have my $TZ_TIMEZONE set:
>>
>> TZ_TIMEZONE="MST7MDT"
>>
>> The actual start and stop dates should be coming out of zoneinfo:
>>
>> [phil...@builder ~/trunk2]$ cat -v /usr/share/zoneinfo/US/Mountain |
>> tail -1
>> MST7MDT,M3.2.0,M11.1.0
>> [phil...@builder ~/trunk2]$
>>
>> why is this not happening?
>>
>> More to the point, why, given a correct TIMEZONE variable, can we not
>> figure out what TZ_TIMEZONE should be set to and set it?
>>
>> -Philip
>
> Interesting,
>
> pbx ~ # tail -1 /usr/share/zoneinfo/America/Chicago
> CST6CDT,M3.2.0,M11.1.0
>
> Has this string always been in the zoneinfo data file? I recall
> looking several years ago and not finding a simple solution to the
> dual time offset settings.
>
> It is still good to be able to override any automatic setting, so the
> politician's whims won't necessarily require a firmware upgrade.
>
> Lonnie
(This should probably be in the DEV list, but we are already here)
I took a look at the TZ list archive. The idea to include "newline-
enclosed POSIX-style time zone string at the end of the file when
possible" was introduced in mid-2005, I don't know when it was
official. (see below)
There is some controversy using "tail -n 1" on a binary file (and
BusyBox does not support cat -v), but it appears to work in AstLinux.
Lonnie
------------
From ols...@lecserver.nci.nih.gov Thu Jun 30 10:59:52 2005
Date: Thu, 30 Jun 2005 10:59:52 -0400 (EDT)
From: Arthur David Olson <ols...@lecserver.nci.nih.gov>
Subject: yet another try at 64-bit changes
Below find the next try at 64-bit changes.
As before, zic writes a second instance of headers and data to time
zone files;
the second instance has eight-byte transition times to cover far-future
(and far past) cases. Zic also puts a newline-enclosed POSIX-style
time zone
string at the end of the file when possible (or, when a zone can't be
represented using POSIX, puts a newline-enclode empty string at the
end of the
file). (Enclosing the string in newlines makes for meaningful output
from the
"tail -1" command applied to time zone files.) When a POSIX-style
string is
available, zic does *not* write 400 years worth of data.
The files that don't have a POSIX string at the end are:
America/Godthab
America/Santiago
Antarctica/Palmer
Asia/Tehran
Asia/Jerusalem
Asia/Tel_Aviv
Chile/Continental
Chile/EasterIsland
Iran
Israel
Pacific/Easter
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