[CentOS] Where is timezone string stored?

Thu Dec 27 21:08:47 UTC 2012
Robert Moskowitz <rgm at htt-consult.com>

On 12/27/2012 03:26 PM, Reindl Harald wrote:
> Am 27.12.2012 21:17, schrieb Robert Moskowitz:
>> I am having problems with RoundCube:
>> 'Your session is invalid or expired'
>> So I went looking for logs and in /var/log/roundcube/errors I find LOTS
>> of warnings about problems with my timezone.  Kind of a challenge to
>> copy the log entries over here (will do if needed).
>> Anyway, for right now I am looking as to where my 'Detroit
>> American/New_York' (what I am seeing in Gnomes calendar preferences)
>> string is stored.
>> Roundcube seems to want 'America/New_York'?
>> Shouldn't I be seeing 'America/Detroit' when I look at the calendar
>> selection in Gnome?
> https://www.google.com/search?q=php+timezone
> php.ini:
> date.timezone = "your-timezone"

Not the place where Centos is storing timezone.  Or perhaps this is 
where RoundCube is expecting it?  This file is at its default content.  
It is timestamped Jul 3.

And /etc/localtime is a binary file.  A little digging and it SEEMS that 
files are copied to /etc/localtime from /usr/share/zonetime ?

But I can't figure out what RoundCube is doing.  Probably will have to 
go and join that list...