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bool date_default_timezone_set ( string timezone_identifier )

date_default_timezone_set() sets the default timezone used by all date/time functions.

Замечание: Since PHP 5.1.0 (when the date/time functions were rewritten), every call to a date/time function will generate a E_NOTICE if the timezone isn't valid, and/or a E_STRICT message if using the system settings or the TZ environment variable.

Instead of using this function to set the default timezone in your script, you can also use the INI setting date.timezone to set the default timezone.

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date_default_timezone_set

php_manual at lk2 dot de
12-Aug-2007 01:37


@davidn at datalinktech dot com dot au



set_default_timezone() has no effect at all on how apache logs are timestamped (at least for me)



It is however true, that all dates and times that php formats that are _not_ timestamps will be in that timezone.



Timestamps are always GMT

legolas558 d0t users dot sf dot net
10-Jun-2007 06:34


http://drakecms.sf.net/index.php?option=content&id=32&Itemid=10



A short tutorial which explains how to consistently implement timezones with PHP4 while remaining forward compatible with PHP5.

PeerGoal.com
12-Feb-2007 04:21


The problem:



date() [function.date]: It is not safe to rely on the system's timezone settings. Please use the date.timezone setting, the TZ environment variable or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected 'America/Los_Angeles' for 'PST/-8.0/no DST' instead



Of course this is a problem that recently surfaced since PHP5. Quick fix is to set your time zone, add this line to your php code:



date_default_timezone_set("America/Los_Angeles");

davidn at datalinktech dot com dot au
21-Dec-2006 05:27


Note that there may be some unexpected side-effects that result from using either set_default_timezone() or the putenv("TZ=...") workalike for earlier PHP versions.  ANY date formatted and output either by PHP or its apache host process will be unconditionally expressed in that timezone.



This does indeed include the web server's logs and other output files and reports which by default usually do not include any indication of timezone. This has a further side-effect on log processing and analysis, obviously.

Chris
22-Nov-2006 10:14


See the user contributed notes for the putenv function for a workaround for previous versions of PHP.

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