[imp] timezone configuration patch

[Seth Fitzsimmons]

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Hey folks.

I threw Chuck a patch that does about the same thing a couple weeks ago.  
Not quite sure what happened to it (I've attempted to attach it here).  
It's got the full list of POSIX Country/City codes in a separate file
(timezone.php, which does in horde/config); they're set up so you can
easily change the description for a given timezone.

I tested a variation of this code (not Horde/IMP) on a Windows
box; doesn't work (as Windows doesn't seem to support TZ env vars).  Not
sure about Solaris.

Michael - I should have put it on the list to potentially save you some
time.  Sorry.

seth

On Tue, 14 Aug 2001, Jan Schneider wrote:

> Wow, thanks Michael for that great work!
> 
> I would like to commit that stuff to cvs, anyone against it?
> 
> Btw: I discovered the same problem with the +0200 notation and didn't find a 
> solution so far. Thanks a lot!
> 
> Jan.
> 
> Zitat von Michael M Slusarz <slusarz@bigworm.colorado.edu>:
> 
> > All,
> > Yet another hack from me :)  This time I grew tired of waiting for a timezone
> > 
> > drop-down menu implementation to be done so I did it myself.
> > 
> > Diffs/new files/pictures of the hack in action can be found at:
> > http://bigworm.colorado.edu/imp-patches/timezone.php
> > 
> > A few things I discovered while putting it together:
> > 
> > 1. A string of the form [+-]0200 ([+-]hours difference from GMT) does NOT 
> > appear to work at all.  I'm using a Linux system, and if you put anything in
> > 
> > this form and send a message it appears that whatever is using the TZ 
> > environment variable (sendmail/postfix/qmail ??) will just ignore it and your
> > 
> > message will be sent with time -0000 GMT.
> > 
> > 2. This is because the correct POSIX.1 TZ implementation is:
> >   STDoffset[DST[offset], (some other stuff...)]
> >   where STD is the 3+ letter code for the time zone and
> >   where DST is the 3+ letter code for the daylight time zone
> > 
> >   Thus, the TZ variable must be something as follows:
> >     EST5EDT
> >     MST7MDT
> >     etc.
> > 
> >   This works fine for american timezones, but it turns out there is no 
> > convention for worldwide timezone abbreviations, etc.  Additionally,
> > half-hour 
> > deviations do not seem to work well.  If you try IT-3:30 (Iran - 3hr 30min.),
> > 
> > it will say your mail message came from about a month ago and stuff.  Plus,
> > the 
> > default DST rules are americanized and may not be correct for the rest of 
> > world - and most likely isn't.  Yuck.
> > 
> > 3. Luckily, there is the POSIX.1 extensions of Country/City which handles all
> > 
> > of these problems.  This convention handles all of the peculiarities that
> > occur 
> > in the same time zones (i.e. there are about 3-4 different time zone rules in
> > 
> > the state of Indiana alone).  This is the way I have implemented my patch.  A
> > 
> > nice thorough list of Country/City combinations can be downloaded from 
> > ftp://elsie.nci.nih.gov/pub/.  These are the timezone codes used by GNU/glibc
> > 
> > based systems.  The only drawback is that I don't know if this will work on a
> > 
> > non GNU-like system (i.e Windows, Solaris).  But this is as good as I think
> > it 
> > can get without implementing an entire timezone system in PHP.
> > 
> > The patch allows you to lock the timezone and set a default timezone (using
> > the 
> > normal syntax in imp/config/prefs.php).
> > 
> > Let me know if you have any questions/comments.
> > 
> > michael
> > 
> > _______________________________________________
> > Michael Slusarz [slusarz@bigworm.colorado.edu]
> > The University of Colorado at Boulder
> > 
> > -- 
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> > 
> > 
> 
> 
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