I had added a cron job with Pre defined "one month"
the command is "wget -N http://geolite.maxmind.com/download/geoip/database/GeoLiteCountry/GeoIP.dat.gz
-O /home/GeoIP.dat.gz && gunzip --force /home/GeoIP.dat.gz"
And It was shown that everything is ok.
But I reflash the page, the cron does't show at cron list.