Build a DateType class with day/month/year format.
Do not forget that :
days : 1-31 (for months: 1,3,5,7,8,10,12), 1-30 (for months: 4,6,9,11),
1-28 (for month: 2) if year is not divided by 4
1-29 (for month: 2) if year is divided by 4
months: 1-12
years: >=2000
default date: 1/1/2000.
I know that this may sound a bit rude, but first try writing it yourself and ask when you get stuck. The only way to learn programming is by coding. Coding teaches things that books can't teach you. Edit: For a good date class for beginners refer to chapter 9 of "Programming -- Principles and Practice Using C++" by Bjarne Stroustrup.
Search online for a Date class in C++, I'm sure you'll get the idea. It's never easy to start a project, even for experienced programmers, because there are a lot of was of going at a problem.