Time Zone Error in Cake php

PHP Warning:  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/Los_Angeles' for '-8.0/no DST' instead in C:\xampp\htdocs\cake_1_2\cake\libs\cache.php on line 429

Warning in cake to resolve this you have to follow this path.

Yourfoldername/cake/libs/cache.php

Open this file

Press ctrl+g and go line no. 570

You will find the code like this

if (!is_numeric($this->settings['duration'])) {

          $this->settings['duration'] = strtotime($this->settings['duration']) - time();

    }

   return true;

simply paste this code:    date_default_timezone_set('UTC');

Example:

if (!is_numeric($this->settings['duration'])) {

                                date_default_timezone_set('UTC');

                                                $this->settings['duration'] = strtotime($this->settings['duration']) - time();

                                }

                                return true;

now check your website problem has been solved.