I don't know much about postscripting in Perl, but here is what you get when you search on "postscript" on CPAN. If you want to generate your calendar as a graphic, I'd suggest one of the modules you'd find under GD.

To print PS to a non-PS printer, yes you will need ghostscript, but that will get handled transparently under most Linux distributions these days (your printer filter will be set up to make it transparent).

HTH

Philosophy can be made out of anything. Or less -- Jerry A. Fodor