Java Date and Time

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    Solving without using Calendar class . Solving using logic. Logic Explaination https://www.youtube.com/watch?v=wGZ1uPj6m7Q

        public static String findDay(int month, int day, int year) {
            
            String[] days = {"MONDAY" ,"TUESDAY","WEDNESDAY", "THURSDAY","FRIDAY","SATURDAY","SUNDAY"};
            int[] months = {6,2,2,5,0,3,5,1,4,6,2,4};
            month--;
            
            int temp = year - 2000;
            int rem;
            
            if (temp < 7){    
                rem =  temp + months[month] + day -1;   
                rem %=7;
              
                return days[rem];
            }
            
            temp *= 1.25;
            rem = temp%7;
            
            if(temp % 4 == 0)    temp--;
             
            rem = rem + months[month] + day - 1;   
            rem %=7;
                
            return days[rem];
            
        }
    
  • + 0 comments

    Solving without using Calendar class . Solving using logic

        public static String findDay(int month, int day, int year) {
            
            String[] days = {"MONDAY" ,"TUESDAY","WEDNESDAY", "THURSDAY","FRIDAY","SATURDAY","SUNDAY"};
            int[] months = {6,2,2,5,0,3,5,1,4,6,2,4};
            month--;
            
            int temp = year - 2000;
            int rem;
            
            if (temp < 7){    
                rem =  temp + months[month] + day -1;   
                rem %=7;
              
                return days[rem];
            }
            
            temp *= 1.25;
            rem = temp%7;
            
            if(temp % 4 == 0)    temp--;
             
            rem = rem + months[month] + day - 1;   
            rem %=7;
                
            return days[rem];
            
        }
    
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    import java.util.*;

    public class Solution {

    public static String findDay(int month, int day, int year) {
        Calendar calendar = Calendar.getInstance();
        calendar.set(year, month - 1, day); // Month is 0-based in Calendar
        String[] days = { "SUNDAY", "MONDAY", "TUESDAY", "WEDNESDAY", 
                          "THURSDAY", "FRIDAY", "SATURDAY" };
        int dayOfWeek = calendar.get(Calendar.DAY_OF_WEEK);
        return days[dayOfWeek - 1];
    }
    
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int month = scanner.nextInt();
        int day = scanner.nextInt();
        int year = scanner.nextInt();
        scanner.close();
    
        String result = findDay(month, day, year);
        System.out.println(result);
    }
    

    }

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    import java.io.; import java.math.; import java.security.; import java.text.; import java.util.; import java.util.concurrent.; import java.util.function.; import java.util.regex.; import java.util.stream.*; import static java.util.stream.Collectors.joining; import static java.util.stream.Collectors.toList;

    class Result { public static String findDay(int month,int day,int year) { Calendar c=Calendar.getInstance(); String[] days={"SUNDAY","MONDAY","TUESDAY","WEDNESDAY","THURSDAY","FRIDAY","SATURDAY"}; c.set(year,month-1,day); return days[c.get(Calendar.DAY_OF_WEEK)-1]; } }

    public class Sound { public static void main(String[] args) throws IOException { BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(System.in)); BufferedWriter bufferedWriter = new BufferedWriter(new FileWriter(System.getenv("OUTPUT_PATH")));

        String[] firstMultipleInput = bufferedReader.readLine().replaceAll("\\s+$", "").split(" ");
    
        int month = Integer.parseInt(firstMultipleInput[0]);
    
        int day = Integer.parseInt(firstMultipleInput[1]);
    
        int year = Integer.parseInt(firstMultipleInput[2]);
    
        String res = Result.findDay(month, day, year);
    
        bufferedWriter.write(res);
        bufferedWriter.newLine();
    
        bufferedReader.close();
        bufferedWriter.close();
    }
    

    }

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    i had no idea how to solve this .but thanks to this discussion board.i solved it