Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
//License from project: Open Source License 

import java.util.Calendar;

public class Main {
    static int daysBetween(Calendar day1, Calendar day2) {
        /**
         * Saved some effort using the solution described here,
         * http://stackoverflow.com/a/28865648/1587370
         */
        Calendar dayOne = (Calendar) day1.clone(), dayTwo = (Calendar) day2.clone();

        if (dayOne.get(Calendar.YEAR) == dayTwo.get(Calendar.YEAR)) {
            return Math.abs(dayOne.get(Calendar.DAY_OF_YEAR) - dayTwo.get(Calendar.DAY_OF_YEAR));
        } else {
            if (dayTwo.get(Calendar.YEAR) > dayOne.get(Calendar.YEAR)) {
                //swap them
                Calendar temp = dayOne;
                dayOne = dayTwo;
                dayTwo = temp;
            }
            int extraDays = 0;

            int dayOneOriginalYearDays = dayOne.get(Calendar.DAY_OF_YEAR);

            while (dayOne.get(Calendar.YEAR) > dayTwo.get(Calendar.YEAR)) {
                dayOne.add(Calendar.YEAR, -1);
                // getActualMaximum() important for leap years
                extraDays += dayOne.getActualMaximum(Calendar.DAY_OF_YEAR);
            }

            return extraDays - dayTwo.get(Calendar.DAY_OF_YEAR) + dayOneOriginalYearDays;
        }
    }
}