Main advantage of this module is its Object Oriented architecture and some features (for example, retriving a date/time format from hash). I think that it is power and flexible.
Well, about using a module Date::Calc, I can find in the CPAN many modules for working with date and time and you can use each of them. I've published this module because I hope that its implementation and functionality will be useful for developers.But I don't assert that "this module is the best". Try to use it and maybe you will find some advantages yourself.

      
--------------------------------
SV* sv_bless(SV* sv, HV* stash);