PHP Warning: strtotime(): It is not safe to rely on the system's timezone settings

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 'Asia/Chongqing' for 'CST/8.0/no DST' instead in /var/www/html/bugfree/Include/Class/TemplateLite/class.template.php on line 97

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 'Asia/Chongqing' for 'CST/8.0/no DST' instead in /var/www/html/bugfree/Include/Class/TemplateLite/plugins/modifier.date_format.php on line 39

PHP Warning:  strftime(): 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 'Asia/Chongqing' for 'CST/8.0/no DST' instead in /var/www/html/bugfree/Include/Class/TemplateLite/plugins/modifier.date_format.php on line 19

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 'Asia/Chongqing' for 'CST/8.0/no DST' instead in /var/www/html/bugfree/Include/Class/TemplateLite/plugins/modifier.date_format.php on line 39

PHP Warning:  strftime(): 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 'Asia/Chongqing' for 'CST/8.0/no DST' instead in /var/www/html/bugfree/Include/Class/TemplateLite/plugins/modifier.date_format.php on line 19

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 'Asia/Chongqing' for 'CST/8.0/no DST' instead in /var/www/html/bugfree/Include/Class/TemplateLite/plugins/modifier.date_format.php on line 39

PHP Warning:  strftime(): 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 'Asia/Chongqing' for 'CST/8.0/no DST' instead in /var/www/html/bugfree/Include/Class/TemplateLite/plugins/modifier.date_format.php on line 19

 

Solution:

Refer to http://wordpress.org/support/topic/php-530-amp-wp-28-it-is-not-safe-to-rely-on-the-systems-timezone

 

在/var/www/html/bugfree/Include/Class/TemplateLite/class.template.php增加一行

                date_default_timezone_set('UTC');
                $this->_version_date = strtotime($this->_version_date);