ayuda con error de php

[lulyhot83]

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 'America/Sao_Paulo' for '-3.0/no DST' instead in C:\xampp\htdocs\.. on line 10


ahora haciendo lo que ustedes me dijeron me da esto chicos ayuda please