[Orgmode] month and day names

[katepano]

Hello All,
I would like to see, in certain files, the names of the months and days 
in Greek. I do that in the Agenda View, by just, denoting it in 
calendar, i.e. by having

(custom-set-variables
'(calendar-day-name-array ["Κυριακή" "Δευτέρα" "Τρίτη" "Τετάρτη" 
"Πέμπτη" "Παρασκευή" "Σάββατο"])
'(calendar-month-name-array ["Ιανουάριος" "Φεβρουάριος" "Μάρτιος" 
"Απρίλιος" "Μάιος" "Ιούνιος" "Ιούλιος" "Αύγουστος" "Σεπτέμβριος" 
"Οκτώβριος" "Νοέμβριος" "Δεκέμβριος"])
)

in my .emacs file. This is not respected however, when I get a timestamp 
in which I have e.g. <2010-07-07 Wed> or in date-tree in org-publish
Any ideas how to fix it? I mean to get <2010-07-07 Τετ>? a little 
googling showed that this goes deep in the emacs locale parameters which 
he gets from POSIX (sounds horrible to me).