I understand now.
In the shoutbox, you would like to change the order of the information. Instead of a separate line for the author and the date of a shout, you would like the date and author in-line with the shout.
You MIGHT LIKE to add the "today" calculation. But I am not certain.
* When a page is loaded, all the shouts in the shoutbox block are loaded using the function template_shoutbox_all, which calls either template_shoutbox_all_curve or template_shoutbox_all_core, depending on the current theme. These functions are found in PortalShoutbox.template.php.
* When the shoutbox is refreshed, automatically or by using the refresh button, javascript is used instead. You will find this in function onShoutReceived, in the file portal.js
You may re-arrange the order of shout author, time, and text in any way it pleases you.
For consistancy, you may wish to make sure that you do it the same way in both locations.
You will probably want to test on a "test" forum before you make your changes go "live" on your real forum.