I used the Google Code Search and it turned up some links that Google Search didn't:

• DateCalc-3.2.README
• some module list
• And finally, the directory of the author, together with DateCalc-3.2.tar.gz, which seems to be the latest version released.

Something about this module sounds fishy - I would venture that Date::Calc has superceeded Date::DateCalc since then, as there is no version of DateCalc left on the CPAN. So if you don't have the pressing need to keep DateCalc, I would recommend looking at Date::Calc and whether it is API compatible with DateCalc.