Calendar using Java with best examples

import java.util.*;  
public class Main{  
   public static void main(String[] args) 
   {  
   // Creating Calendar object
   Calendar calendar = Calendar.getInstance();  
   
   // To get the current date and time
   System.out.print("Current Date and Time is - " + calendar.getTime());  
   }  
}  

import java.util.*;

public class Main {
   public static void main(String[] args) {
   
        // Creating Calendar object
        Calendar calendar = Calendar.getInstance();
        
        // To get hour of the current day
        int hours = calendar.get(Calendar.HOUR);
        
        // To get minute of the current day
        int minutes = calendar.get(Calendar.MINUTE);
        
        // To get hour of the current day
        int seconds = calendar.get(Calendar.SECOND);
        
        // To get hour of the current day
        int milliseconds = calendar.get(Calendar.MILLISECOND);
        
        // To get hour of the current day
        int day = calendar.get(Calendar.DATE);
        
        // To get hour of the current day
        int month = calendar.get(Calendar.MONTH) + 1;
        
        // To get hour of the current day
        int year = calendar.get(Calendar.YEAR);
        
        // To get hour of the current day
        int dayOfWeek = calendar.get(Calendar.DAY_OF_WEEK);
        
        // To get hour of the current day
        int dayOfMonth = calendar.get(Calendar.DAY_OF_MONTH);
        
        // To get hour of the current day
        int dayOfYear = calendar.get(Calendar.DAY_OF_YEAR);
        
        // To get hour of the current day
        int hourOfDay = calendar.get(Calendar.HOUR_OF_DAY);
                
        System.out.println("\nCurrent Hour : " + hours);
        System.out.println("Current Minute : " + minutes);
        System.out.println("Current Second : " + seconds);
        System.out.println("Cuurent Millisecond : " + milliseconds);
        System.out.println("Current Date and Time : " + calendar.getTime());
        System.out.println("Current Date : " + day);
        System.out.println("Current Month : " + month);
        System.out.println("Current Year : " + year);
        System.out.println("Day of Week : " + hourOfDay);
        System.out.println("Day of Week : " + dayOfWeek);
        System.out.println("Day of Month : " + dayOfMonth);
        System.out.println("Day of Year : " + dayOfYear);
    }
}

import java.util.*;  
public class Main{  
   public static void main(String[] args) { 
   
   Calendar calendar = Calendar.getInstance();  
   
   //To get the date and time 25 days ago from the current date
   calendar.add(Calendar.DATE, -25);  
   System.out.println("25 days ago: " + calendar.getTime());  
   
   //To get the date and time 2 months later from the current date
   calendar.add(Calendar.MONTH, 2);  
   System.out.println("2 months later: " + calendar.getTime());  
   
   //To get the date and time 5 years later from the current date
   calendar.add(Calendar.YEAR, 5);  
   System.out.println("5 years later: " + calendar.getTime());  
   }  
}  

#Importing the library
import java.util*;

public class MonthCalendar {

     public static void main(String[] args) {
     Scanner scan = new Scanner (System.in);
     System.out.print("Enter year : ");
     int year = scan.nextInt();
     System.out.print("Enter month : ");
     int month = scan.nextInt();

      if (month < 1 || month > 12)
          System.out.println("Wrong input!");
      else
          printMonth(year, month);
   }
     static void printMonth(int year, int month) {
          printMonthTitle(year, month);
          printMonthBody(year, month);
    }
      static void printMonthTitle(int year, int month) {
          System.out.println("         " + getMonthName(month) + " " + year);
          System.out.println(" Sun Mon Tue Wed Thu Fri Sat");
    }
    static String getMonthName(int month) {
      String monthName = null;
      switch (month) {
        case 1: monthName = "January"; break;
        case 2: monthName = "February"; break;
        case 3: monthName = "March"; break;
        case 4: monthName = "April"; break;
        case 5: monthName = "May"; break;
        case 6: monthName = "June"; break;
        case 7: monthName = "July"; break;
        case 8: monthName = "August"; break;
        case 9: monthName = "September"; break;
        case 10: monthName = "October"; break;
        case 11: monthName = "November"; break;
        case 12: monthName = "December";
      }
      return monthName;
    }
    static void printMonthBody(int year, int month) {
      int startDay = getStartDay(year, month);
      int numberOfDaysInMonth = getNumberOfDaysInMonth(year, month);
      int i = 0;
      for (i = 0; i < startDay; i++)
        System.out.print("    ");
      for (i = 1; i <= numberOfDaysInMonth; i++) {
        if (i < 10)
          System.out.print("   " + i);
        else
          System.out.print("  " + i);
        if ((i + startDay) % 7 == 0)
          System.out.println();
      }
      System.out.println();
    }
   static int getStartDay(int year, int month) {
      int startDay1800 = 3;
      int totalNumberOfDays = getTotalNumberOfDays(year, month);
      return (totalNumberOfDays + startDay1800) % 7;
    }
    static int getTotalNumberOfDays(int year, int month) {
     int total = 0;
     for (int i = 1800; i < year; i++)
     if (isLeapYear(i))
        total = total + 366;
      else
        total = total + 365;
      for (int i = 1; i < month; i++)
        total = total + getNumberOfDaysInMonth(year, i);
      return total;
    }
    static int getNumberOfDaysInMonth(int year, int month) {
      if (month == 1 || month == 3 || month == 5 || month == 7 || month == 8 || month == 10 || month == 12)
        return 31;
      if (month == 4 || month == 6 || month == 9 || month == 11)
        return 30;
      if (month == 2) return isLeapYear(year) ? 29 : 28;
      return 0; 
    }
    static boolean isLeapYear(int year) {
      return year % 400 == 0 || (year % 4 == 0 && year % 100 != 0);
    }
}

#Importing the libraries
import java.io.*;
import java.util.*;

public class MonthCalendar {
  public static void main(String a[])
  {
    Scanner sc = new Scanner(System.in);
    System.out.print("Enter the year : ");
    int yy = sc.nextInt();
    System.out.print("Enter month : ");
    int mm = sc.nextInt();
    int d = 1;
    int month = 1;
    int year = 1;
    int day = 1;
    
    // Storing the name of days
    String days[] = { "SUN", "MON", "TUE", "WED", "THU", "FRI", "SAT" };
    
    // Storing the name of months
    String months[]
      = { "JANUARY", "FEBRUARY", "MARCH","APRIL", "MAY",  "JUNE",
        "JULY", "AUGUST", "SEPTEMBER","OCTOBER", "NOVEMBER", "DECEMBER" };
        
    // Storing the number of days in each month
    int ar[] = { 31, 29, 31, 30, 31, 30,31, 31, 30, 31, 30, 31 };
    
    while (true) {
      if (d == 1 && month == mm && year == yy) {
        break;
      }
      if (year % 4 == 0 && year % 100 != 0 || year % 100 == 0) {
        ar[1] = 29;
      }
      else {
        ar[1] = 28;
      }
      day++;d++;
      
      if (d > ar[month - 1]) {
        month++;
        d = 1;
      }
      if (month > 12) {
        month = 1;year++;
      }
      if (day == 7) {
        day = 0;
      }
    }
    int c = day;
    if (year % 4 == 0 && year % 100 != 0 || year % 400 == 0) {
      ar[1] = 29;
    }
    else {
      ar[1] = 28;
    }
    System.out.println("MONTH:" + months[mm - 1]);
    for (int k = 0; k < 7; k++) {
      System.out.print(" " + days[k]);
    }
    System.out.println();
    for (int j = 1; j <= (ar[mm - 1] + day); j++) {
      if (j > 6) {
        day = day % 6;
      }
    }
    int spaces = day;
    if (spaces < 0)
      spaces = 6;
      
    # Printing the Calendar
    for (int i = 0; i < spaces; i++)
      System.out.print("   ");
    for (int i = 1; i <= ar[mm - 1]; i++) {
      System.out.printf(" %2d ", i);
      
      if (((i + spaces) % 7 == 0)
        || (i == ar[mm - 1]))
        System.out.println();
    }
  }
}