Another possibility (apart from all the other ideas here) would be to use the Date::Manip module, which can handle (both parse and produce) dates in several different languages (search in the documentation for "Language" to see the supported ones). For example:

use strict;
use Date::Manip;

my $d=ParseDate("today");
foreach my $l (qw(English French Swedish German Spanish Italian)) {
  Date_Init("Language=$l");
  print "$l: ".UnixDate($d, "%F\n");
}
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Which produces:

English: Wednesday, September 27, 2000
French: mercredi, septembre 27, 2000
Swedish: Onsdag, September 27, 2000
German: Mittwoch, September 27, 2000
Spanish: Miercoles, Septiembre 27, 2000
Italian: Mercoledi, Settembre 27, 2000
[download]

Note a few points:

• I did the ParseDate before changing the language from English (the default), because otherwise I would have had to change "today" to each language in turn.
• I couldn't find a way for it to change the format according to each language's conventions, as mentioned by ar0n.
• If all you need are month names, Date::Manip may be overkill, because it is a very big module. But if you need dates in general, it might be worth a try.

--ZZamboni