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Bug #40202 Arizona timezone detected as America/Denver
Submitted: 2007-01-23 04:41 UTC Modified: 2007-01-23 14:28 UTC
From: ajb at blyler dot cc Assigned:
Status: Not a bug Package: *General Issues
PHP Version: 5.2.0 OS: Linux
Private report: No CVE-ID: None
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 [2007-01-23 04:41 UTC] ajb at blyler dot cc 
Description:
------------
When the timezone (/etc/localtime) is set to Arizona time a call to date_default_timezone_get() returns America/Denver.

Which causes the date/time functions in php to incorrectly return date/time data since Arizona does not observe daylight savings.

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 [2007-01-23 08:15 UTC] derick@php.net 
So set the correct time zone in php.ini:
http://no.php.net/manual/en/ref.datetime.php#ini.date.timezone
 [2007-01-23 14:15 UTC] ajb at blyler dot cc 
Setting the time zone in the php.ini file works just fine.  

But why doesn't php detect that /etc/localtime is set to Arizona's time zone?  I would think that php would detect Arizona's time zone as America/Phoenix and not America/Denver.  Since these time zones are different.
 [2007-01-23 14:28 UTC] derick@php.net 
I am aware that they are different, but we can not rely on the /etc/localtime link, as that is something extremely distribution and OS dependent. Now, in order for PHP to detect which timezone it is in, it uses a few parameters: offset to GMT combined with DST, and the abbreviation. At the moment, all of these parameters are the same for both locations:

derick@kossu:~$ TZ=America/Denver date +"%z %Z"
-0700 MST
derick@kossu:~$ TZ=America/Phoenix date +"%z %Z"
-0700 MST

and then we just have to pick one.
Please remember, that making the setting is the correct way of doing things. The detection is there just to take care of BC issues as much as possible.
 
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