Question

3. Using no date-specific Java libraries, write a program that computes
the number of days between any two dates (inclusive). You must take
into account leap years. The rule for computing a leap year is as
follows: If the year is divisible by 4 it is a Leap Year ...
Unless the year is divisible by 100, then it is _not_ a Leap Year
... Unless the year is divisible by 400, then it _is_ a Leap Year.

During a Leap year, an extra day is added at the end of the month
of Feb.

ex. 1000 is not a Leap Year
2000 is a Leap year

Your program must be run as follows:
PROMPT>> java DaysBetween 11/11/2002 11/12/2002
1 day
(program ends)

Error checking. Be sure to handle at least the following:
- if there is too few or too many input parameters
- if the date strings are not in the proper format
(simply echo usage statement);
- if date 1 is not earlier than date 2

Answer 1

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ANSWER::-

as for given data....

Using Localdate Java libraries, write a program that computes
   the number of days between any two dates (inclusive). You must take
   into account leap years. The rule for computing a leap year is as
   follows: If the year is divisible by 4 it is a Leap Year ...
   Unless the year is divisible by 100, then it is _not_ a Leap Year
   ... Unless the year is divisible by 400, then it _is_ a Leap Year.
   
   During a Leap year, an extra day is added at the end of the month
   of Feb.

CODE ::-

import java.time.LocalDate;
import java.time.format.DateTimeFormatter;
import java.time.temporal.ChronoUnit;

public class DaysBetween {
public static void main(String[] args) {

   try {
   if(args.length==2) {
       DateTimeFormatter formatter = DateTimeFormatter.ofPattern("MM/dd/yyyy");
LocalDate startDate = LocalDate.parse(args[0],formatter);
LocalDate endtDate = LocalDate.parse(args[1],formatter);
Long range = ChronoUnit.DAYS.between(startDate, endtDate);
if(range<0) {
   System.out.println("date 1 is not earlier than date 2");
}else {
   System.out.println(range+" day");
}
  
   }else {
       System.out.println("Please check the command line lengh");
   }
   }catch(Exception e){
       System.out.println("Please give the correct date format as MM/DD/YYYY");
   }

}
}

Running program:
java DaysBetween 03/01/1000 02/29/1000

OUT PUT ::-

date 1 is not earlier than date 2

Run2:
java DaysBetween 11/11/2002 11/12/2002
1 day

THANK YOU...!!