[tz] CST timezone that does not account for DST

[Paul_Koning at dell.com]

> On Jul 30, 2015, at 2:21 PM, Brian Inglis <Brian.Inglis at systematicsw.ab.ca> wrote:
> 
> On 2015-07-30 09:24, random832 at fastmail.us wrote:
>> On Wed, Jul 29, 2015, at 17:56, Nilesh Parmar wrote:
>>> How can we have CST timezone that does not account for DST ?
>>> Using the POSIX string, we can create a timezone called CST that is GMT+6
>>> as follows:
>> That's GMT-6. GMT+6 is the time in e.g. Kazakhstan, and is not AFAIK
>> called CST anywhere it is used.
>>> [root at hp-dl120gen9-01 ~]# TZ=:CST6 date
>>> Thu Jul  9 06:50:29 CST 2015
>> You shouldn't use the : if you are using a POSIX string. Just TZ=CST6
>> should work on any POSIX system.
>>> But this is not consitent if tzdata package is update.
>> Why not?
>>> Also this does take into account DST change?
>> It shouldn't.
>> Anyway, if this is for Saskatchewan what's wrong with America/Regina?
>> What do you need this for?
> 
> In Canada, areas that do not change their GMT offset do change their time
> legally at the same time as the rest of North America, from CST to MDT or
> MST to PDT, etc. i.e. they observe the daylight saving time of the zone to
> the west. ;^>

You can certainly use GMT-x as a workaround for that.  But such timezones are covered by specific rules.  If one is missing, or incorrect, that should be reported and fixed.

	paul