Date Calculation « Date « Ruby






1.Subtract 61 days from a date:
2.Add and subtract six months using the >> and << methods.
3.Doing Date Arithmetic
4.Doing DateTime Arithmetic
5.Minus one DateTime from another
6.Move DateTime
7.leap year day
8.Counting the Days Since an Arbitrary Date
9.advent calendar








10.Minus DateTime by day
11.Remaining days