Appserv y PHP

[Juan_Carlos_21]

Hola, estoy construyendo una web y mi servidor appserv me muestra este error con una de mis funciones:

"Strict Standards: strtotime() [function.strtotime]: It is not safe to rely on the system's timezone settings. Please use the date.timezone setting, the TZ environment variable 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/New_York' for '-5.0/no DST' instead in C:\AppServ\www\mangos\mangos_php\comentarios.php on line 65

Strict Standards: date() [function.date]: It is not safe to rely on the system's timezone settings. Please use the date.timezone setting, the TZ environment variable 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/New_York' for '-5.0/no DST' instead in C:\AppServ\www\mangos\mangos_php\comentarios.php on line 65"

y por mas que he buscado no comprendo el error, gracias a quien me pueda ayudar!