Cron syntax under /cf/conf/config.xml

[MaxFontana]

Hi there!
I'd like to schedule a wol every monday at 7:30 AM sending a "magic packet" to a specific IP
I already found a similar request but I don't know how to set all this under the cron section of the config.xml file.
Any help would be very much appreciated.
Thanks in advance.
best regards.
Max
Italy