Program to find differences of two dates in days in java

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mahmoud2506

2022-05-06

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Program

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class ExCalculateDays {
  // create buffer class object.
  static BufferedReader BR = new BufferedReader(new InputStreamReader(System.in));
  int month[] = {
    0,
    31,
    28,
    31,
    30,
    31,
    30,
    31,
    31,
    30,
    31,
    30,
    31
  };

  //create function for checking Leap Year or not. 
  int isLeap(int y) {
    if ((y % 400 == 0) || ((y % 100 != 0) && (y % 4 == 0)))
      return 29;
    else
      return 28;
  }

  // create function for checking date is valid or not.
  boolean dateValidate(int d, int m, int y) {
    month[2] = isLeap(y);
    if (m < 0 || m > 12 || d < 0 || d > month[m] || y < 0 || y > 9999)
      return false;
    else
      return true;
  }

  // this function calculate days between given dates. 
  int dayno(int d, int m, int y) {
    int dn = 0;
    month[2] = isLeap(y);
    for (int i = 1; i < m; i++) {
      dn = dn + month[i];
    }
    dn = dn + d;
    for (int i = 1; i < y; i++) {
      if (isLeap(i) == 29)
        dn = dn + 366;
      else
        dn = dn + 365;
    }
    return dn;
  }

  public static void main(String args[]) throws IOException {
    ExCalculateDays CD = new ExCalculateDays();

    // Enter the dates one by one.
    System.out.print("Enter the first date in (dd/mm/yyyy) format: ");
    String date1 = BR.readLine().trim();
    int p, q;

    // calculate the days.
    p = date1.indexOf("/");
    int d1 = Integer.parseInt(date1.substring(0, p));

    //calculating the month
    q = date1.lastIndexOf("/");
    int m1 = Integer.parseInt(date1.substring(p + 1, q));

    // calculating the year
    int y1 = Integer.parseInt(date1.substring(q + 1));

    System.out.print("Enter the second date in (dd/mm/yyyy) format: ");
    String date2 = BR.readLine().trim();

    p = date2.indexOf("/");
    int d2 = Integer.parseInt(date2.substring(0, p));

    q = date2.lastIndexOf("/");
    int m2 = Integer.parseInt(date2.substring(p + 1, q));
    int y2 = Integer.parseInt(date2.substring(q + 1));

    // check for valid input of dates.
    if (CD.dateValidate(d1, m1, y1) == true && CD.dateValidate(d2, m2, y2) == true) {
      int a = CD.dayno(d1, m1, y1);
      int b = CD.dayno(d2, m2, y2);

      // print the final result.
      System.out.print("Days between " + date1 + " " + " and " + date2 + " " + " is : " + Math.abs(a - b) + " days.");
    } else
      // otherwise invalid input of dates.
      System.out.println("Invalid Dates...");
  }
}

Output

First run:
Enter the first date in (dd/mm/yyyy) format: 12/12/2016
Enter the second date in (dd/mm/yyyy) format: 12/12/2017
Days between 12/12/2016  and 12/12/2017  is : 365 days.

Second run:
Enter the first date in (dd/mm/yyyy) format: 12/2017/12
Enter the second date in (dd/mm/yyyy) format: 22/2017/12
Invalid Dates...

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total answers (1)

Program to find differences of two dates in days in java

Program to find differences of two dates in days in java

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