@Cdesja5 - it doesn't sound like something appropriate for this plugin and it isn't clear what "date" you are talking about. Do you mean book metadata (like published date), or do you mean the metadata jacket html page that you can optionally insert? If you mean the former, IIRC calibre writes in UTC format which is universally handled and I doubt Kovid would want to offer a change, it should be whatever reading device you have that handles that.
If you mean the latter (a jacket page) then again it isn't the responsibility of this plugin. You might be able to customise the date format by customising the jacket template file, which there are instructions for on the forum if you do a search. Either way it isn't something that belongs in this plugin - the plugin calls calibre code to apply metadata/insert jackets, so if you want that data different it is calibre code that needs to be changed.
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