Timezones in Cakephp 1.3 and php 5.3.

I recently updated to php version 5.3.5, and immeiately got the following error in my Cakephp 1.3.x apps:

    Warning (2): strtotime() [http://php.net/function.strtotime]: It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting 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/Chicago' for 'CST/-6.0/no DST' instead [CORE/cake/libs/cache.php, line 570]
    Code | Context

    $settings   =   array(
            "engine" => "File",
            "path" => "/private/var/www/skyrocketstudio.com/app/tmp/cache/persistent/",
            "prefix" => "cake_core_",
            "lock" => false,
            "serialize" => true,
            "isWindows" => false,
            "duration" => "+10 seconds",
            "probability" => 100
    )

    strtotime - [internal], line ??
    CacheEngine::init() - CORE/cake/libs/cache.php, line 570
    FileEngine::init() - CORE/cake/libs/cache/file.php, line 81
    Cache::_buildEngine() - CORE/cake/libs/cache.php, line 151
    Cache::config() - CORE/cake/libs/cache.php, line 126
    Configure::__loadBootstrap() - CORE/cake/libs/configure.php, line 420
    Configure::getInstance() - CORE/cake/libs/configure.php, line 52
    include - CORE/cake/bootstrap.php, line 38
    require - APP/webroot/index.php, line 76
    [main] - CORE/index.php, line 55

    Notice: Trying to get property of non-object in /private/var/www/skyrocketstudio.com/cake/libs/cache/file.php on line 248 Fatal error: Call to a member function cd() on a non-object in /private/var/www/skyrocketstudio.com/cake/libs/cache/file.php on line 248 

Turns out it's an easy fix- uncomment date_default_timezone_set('UTC');(around line 242) in your core.php file.

For convenience' sake, here's a list of US timezones, taken from a comment that I always have to refer back to on php.net [http://www.php.net/manual/en/timezones.america.php#93028]