Hi..
yes, you can.. you need 2 scripts
one in /etc (for example), like this
KO=which poweroff
echo $KO
called shut_down.sh
and another one in /etc/cron.d/ like this
# Antivirus Statistics Crond Entry
#+-----------------------Minute (0-59)
#| +-------------------Hour of Day (0-23)
#| | +---------------Day of Month (1-31)
#| | | +-----------Month of Year (1-12)
#| | | | +-------Day of Week (0=Sun,6=Sat)
#v v v v v
3 0 * * * root /etc/shut_down.sh
called, for example, shutdown.cron
be sure that /etc/shut_down.sh can be executed
chmod 750 /etc/shut_down.sh
HTH
Ciao
Stefano