Problema en todas las aulas virtuales del centro

[des_angeles.loeches]

Desde ayer aparecen en todas estos mensajes:

Warning: strftime() [function.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 'Europe/Berlin' for 'CEST/2.0/DST' instead in /var/www/html/aulavirtual/lib/moodlelib.php on line 1253

Warning: strftime() [function.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 'Europe/Berlin' for 'CEST/2.0/DST' instead in /var/www/html/aulavirtual/lib/moodlelib.php on line 1254


Warning: getdate() [function.getdate]: 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/Berlin' for 'CEST/2.0/DST' instead in /var/www/html/aulavirtual/lib/moodlelib.php on line 1303

Warning: mktime() [function.mktime]: 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/Berlin' for 'CEST/2.0/DST' instead in /var/www/html/aulavirtual/lib/moodlelib.php on line 1130

Aunque funcionan es bastante incómodo porque aparecen un montón de veces repetidos en todas las columnas y apartados de la página principal de cada aula virtual.

¿Alguien sabe a que se debe y que debo hacer?. No hemos hecho nada diferente a lo que salemos hacer.
Seguimos teniendo la versión antigua, no la hemos migrado.

Gracias anticipadas

[des_angeles.loeches]

Resuelto. Parece ser que era un error del sistema y se ha solucionado solo.
Buen día

[des_webmaster]

Estimada usuaria... Efectivamnete, esos mensajes aparecieron durante la tarde del jueves y a primera hora del viernes. El problema ya quedó solucionado.

Un saludo.