Java Calendar class

Question

I copied code from the web for calculating the number of days between two dates. it often produces incorrect results. For example, The days between 01/15/2008 and 03/15/2010 are 790. The code returns 789. The days between 12/30/2013 and 02/28/2017 are 1156. The code returns 1152. Are the errors due to the code or Calendar class? I am copying the code below. This is my first post and I apologize for any protocol errors. Thanks, Nick

import java.util.Calendar;

public class DateExperiment2 
{ 
  public static void main(String args[]) throws Exception
  {
    // Create Calendar instances
    Calendar calendar1 = Calendar.getInstance();
    Calendar calendar2 = Calendar.getInstance();

    // Set the values for the calendar fields YEAR, MONTH, and DAY_OF_MONTH.
    calendar1.set(2008, 1, 15);
    calendar2.set(2010, 3, 15);

    //Get Calendars' time value in milliseconds
    long miliSecondForDate1 = calendar1.getTimeInMillis();
    long miliSecondForDate2 = calendar2.getTimeInMillis();

    // Calculate the difference in millisecond between two dates
    long diffInMilis = miliSecondForDate1 - miliSecondForDate2;

   //Convert milliseconds to days
    long diffInDays = diffInMilis / (24 * 60 * 60 * 1000);

    System.out.println(diffInDays);
  }
}

Answer 1

The results and the is good But when you set month on 01

`Calendar.Set(2000,1,15)`

That means you set it on 15 February 2000 Month on Calender start from 0

0 =is January 1= February...