[imp] timezone configuration patch

Jan Schneider janmailing@gmx.de
Tue, 14 Aug 2001 11:28:06 +0200


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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