[lug] Disable daylight savings time

[Gary Hodges]

Thanks for pointing me in a promising direction.  I'll play around with
it next week and report back.

Gary

----- Original Message -----
From: Scott Herod <herod at dimensional.com>
Date: Saturday, July 10, 2004 11:11 am
Subject: Re: [lug] Disable daylight savings time

> On Sat, 10 Jul 2004, Gary Hodges wrote:
> 
> > I'm not generating any respones to this on a Debian newsgroup, 
> so I
> > thought I'd try here.  How can I disable daylight savings so the 
> machine> always operates in standard time?  I figured this would 
> be an easy
> > Google find, but it seems not.  
> > 
> > My problem is with the Pacific time zone.  I have some software that
> > offers multiple selections for all the other times zones I have
> > instruments in, one of which is always a place that doesn't follow
> > daylight savings, e.g., Arizona(-7) and Indiana (-5).  I only 
> have one
> > choice for Pacific (-8), so all my data there are time stamped with
> > local daylight time.  Setting the machine to local standard time 
> would> be an easy fix for me.
> > 
> > Gary
> > 
> 
> 
> Hi Gary,
> 
> Daylight savings time changes are encoded in files in 
> /usr/share/zoneinfo/.  You can use zdump to print out the files in 
> a 
> readable format.  For example:
> 
> [bash]% zdump -v /usr/share/zoneinfo/US/Mountain
> /usr/share/zoneinfo/US/Mountain  Fri Dec 13 20:45:52 1901 UTC = 
> Fri Dec 13 
> 13:45:52 1901 MST isdst=0 gmtoff=-25200
> /usr/share/zoneinfo/US/Mountain  Sat Dec 14 20:45:52 1901 UTC = 
> Sat Dec 14 
> 13:45:52 1901 MST isdst=0 gmtoff=-25200
> /usr/share/zoneinfo/US/Mountain  Sun Mar 31 08:59:59 1918 UTC = 
> Sun Mar 31 
> 01:59:59 1918 MST isdst=0 gmtoff=-25200
> /usr/share/zoneinfo/US/Mountain  Sun Mar 31 09:00:00 1918 UTC = 
> Sun Mar 31 
> 03:00:00 1918 MDT isdst=1 gmtoff=-21600
> 
> (etc)
> 
> I think that you may want to use a timezone in the 
> /usr/share/zoneinfo/Etc/ directory.  For example, check
> zdump -v /usr/share/zoneinfo/Etc/GMT-8.  (That is PST right?)
> 
> Then once you have decided on a timezone file you can copy it to 
> /etc/localtime.  For example, on my machine:
> 
> diff /etc/localtime /usr/share/zoneinf
> returns empty.
> 
> Be aware that every running process has static data containing the 
> timezone info which cannot be updated.
> 
> Scott
> 
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