###The Date Calculator

Environment:

• The following software will run in any machine which has NodeJS installed.

How to run:

• To run the app, simply type npm start.

Testing:

• Run npm install -g mocha before running the test cases.
• To run the tests, type npm test.

Logic:

• The main idea is to calculate the distance between any two dates in terms of days elapsed:
  • Between the two given years, not considering the day and month.
  • Between the (day,month) pairs, only considering the year if it's a leap year.
• Subtract the days that have already passed for the starting year of the given range.
• The addition of the distance returned from above step will give us the difference between any two dates.