Gracias por la respuesta.
Ahora parece que si funciona, aunque me coge la hoja de <12.
Tambien me salta este aviso:
Código PHP:
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/Paris' for '2.0/DST instead in C:xampphtdocselabcwebindex.php on line 22