First I need to try it on the test site, then the client site. It's not my site, so must be careful.
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// Check if the default timezone has been set, if not set it to UTC
// For a list of supported timezones see here - http://www.php.net/manual/en/timezones.php
// To set your own timezone comment out this code and use this example
// date_default_timezone_set('Europe/London');
if(function_exists("date_default_timezone_get")){
if(!date_default_timezone_get()){
date_default_timezone_set('UTC');
}
}