Schedule a Cron job

Hi all,

I am new to cron jobs..

i wanted to schedule a cron job that wil send a mail to me at 3:00PM on 10th August ie is on Wednesday.

0 15 10 8 3 echo "message from UNIX here"|mail -s "your subject here" user@user.com

However this was not executed...

Can anyone please assist me in this.

Thanks in advance.