Change date format in comments How can I change the date format in my comments?

Right now it looks like this:


  Sat, 09/01/2012 - 12:00


I want it to look like this:


  Saturday, September 1, 2012


I was able to achieve this in page.tpl.php in a section where I just display the date, but have no idea where to do this so it works for my comments too.
If you want to do it sitewide, you can edit the definitions at admin/config/regional/date-time/formats

You can also add your own formats there, and then use them in format_date() similar to what @Epok outlined.