Cron Jobs problem

[dogday]

I have a file named crear into public_html folder that looks like this:

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#!/bin/bash

archivo=`date -u +%d'metalmorfosis.tar.gz'`
cd /home/myusername/domains/mydomain.com/public_html
tar cfspz $archivo metalmorfosis.jpg

ftp -vn ftp.myftp.com << End-Of-Sessionl
user myuser mypassword
binary
put $archivo
bye

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I want to execute this file from cron jobs in my directadmin panel

What is the way to do it?

Is the syntax of my file correct ?

Thanks in advance.