First of all, Cody Pendant, it has nothing to do with laziness. That's why we're all PMs.

I'm a big fan of Date::Calc, but it is missing some formatting functions, so you will need to rely on sprintf if you need output in a particular format, especially if you need full dates. Date::Calc will return 2004-4-5, so you might need sprintf to 'round' things out to 2004-04-05.