Q: How do I add two dates?
A (short): Use Date::Calc.
A (long): Use Date::Calc. Watch out for time zone and DST issues.
Really excellent example! Why, just the other day, I wanted to know the sum of June 13th 1993 and October 23rd 1936. Date::Calc was just the thing for this common, but thorny, problem!
Everybody knows to use Date::Calc for subtracting one date from another to get the number of dates they span or adding or subtracting a number of days to/from a given date, but not everybody knows the great utility that Date::Calc can be in adding two dates!