Problemas al Actualizar

Bueno leyeron el post anterior sobre mi problema lo solucione ahora intengo actualizar vb 3.8.2 a la ver 3.8.6 y hago el upgrade.php pero me sale el siguiente error:

Código:

Warning: date() [function.date]: 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 'Europe/Moscow' for 'MSK/3.0/no DST' instead in /home/yourchea/public_html/foro/install/upgrade_language_en.php on line 197

Warning: date() [function.date]: 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 'Europe/Moscow' for 'MSK/3.0/no DST' instead in /home/yourchea/public_html/foro/install/upgrade_language_en.php on line 197

Warning: header() [function.header]: 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 'Europe/Moscow' for 'MSK/3.0/no DST' instead in /home/yourchea/public_html/foro/includes/functions.php on line 3103

Warning: Cannot modify header information - headers already sent by (output started at /home/yourchea/public_html/foro/install/upgrade_language_en.php:197) in /home/yourchea/public_html/foro/includes/functions.php on line 3103

Por favor espero sus respuestas