Date Validator

This part of the assignment requires you to write a program that will test whether a combination of a given day, month and year is a real date.

Core:

For the core version you can assume that:

All months have 31 days, numbered 1 to 31
The months run from 1 to 12
Years start from 1

You should complete the validateDateCore method.

You will need to ask the user to provide:

A day
A month
A year

Therefore the date made up from:

Day 31
Month 2
Year 2016

is valid, but the date made up from:

Day 0
Month 2
Year 2016

is not valid.

Note: Make sure to test your program both on dates which should be valid and those which should not.

Download the project zip file and import it into Eclipse to start working.

Completion:

For the completion, you should improve your program in several ways.

Months should have the correct number of days (shown in the table below)
In leap years (only) February should have 29 days. A year is a leap year if:
1. The year can be evenly divided by 4 but not 100
2. The year can be evenly divided by 400

Month	Days
January	31
February	28
March	31
April	30
May	31
June	30
July	31
August	31
September	30
October	31
November	30
December	31

To do this complete the dateValidatorCompletion method.

Hint: You can find out the remainder after a division using %. So 5 % 4 = 1 (5 / 4 has remainder 1), while 20 % 5 = 0 (20 / 5 has remainder 0, i.e. it can be evenly divided by 5).

Challenge:

For the challenge, your program should be extended to deal with the transition from the Julian to Gregorian calendar. The program should look at the date, determine whether this should be a Julian or Gregorian date, and test it appropriately. You will need to find the rules of the Julian calendar yourselves.