$wordpress_user_db_query = mysql_query("INSERT INTO cedsite_wrdp1.wp_users (`user_login`, `user_pass`, `user_nicename`, `user_email`, `user_url`, `user_registered`, `user_activation_key`, `user_status`, `display_name`) VALUES
('".$username."', '".md5($pass)."', '".$username."', '".$email."', '', '".$date."', '', 0, '".$username."');");

Using PHP I am trying to do that, but it isn't working. Can someone help?

Try this, and paste the error here:

$wordpress_user_db_query = mysql_query("INSERT INTO cedsite_wrdp1.wp_users (`user_login`, `user_pass`, `user_nicename`, `user_email`, `user_url`, `user_registered`, `user_activation_key`, `user_status`, `display_name`) VALUES
('$username', '" . md5($pass) . "', '$username', '$email', '', '$date', '', 0, '$username')") or die(mysql_error());
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