I found a template to control how the subject of a list's digest  
messages is sent out, but I am not sure I understand how to change it  
to use the format I want.

What do I need to include in the template to have the following  
format for the subject of each digest message?

Digest for dayname, month, day, year ?

Example

Digest for Thursday, January 25, 2007

This is for a list where the digest will be the usual once a day  
transmission.