Saved me time!

Nice... very easy

thank u

its not working

It's clear . Thanks . I will read about Date in java 8

In order to use this solution you need to import

java.time.LocalDate

which is not allowed to import a library in this challenge.

Here is my solution. Please be aware of starting index number for months starting from zero. Good luck everyone!

DateFormatSymbols dfs = new DateFormatSymbols(Locale.US);
String weekdays[] = dfs.getWeekdays();
        
Calendar cal = new GregorianCalendar(Locale.US);
cal.set(Integer.parseInt(year), Integer.parseInt(month)-1, Integer.parseInt(day));

System.out.println(weekdays[cal.get(Calendar.DAY_OF_WEEK)].toUpperCase());

Very compact... like it! Thanks!

Why Calendar.getInstance() gives wrong results?

this code is not working.it shows error in these line LocalDate dt = LocalDate.of(yy, mm, dd); System.out.print(dt.getDayOfWeek());

error: cannot find symbols

Its really very easy....

Not Working,try for dd=08

Thank you.

not working in java 8 as well

Exception in thread "main" java.lang.Error: Unresolved compilation problem: The method of(int, Month, int) in the type LocalDate is not applicable for the arguments (String, String, String)

at Date_HR.main(Date_HR.java:14)

Easy but it is showing error even after importing LocalDate

Can explain the process? :P It would be really helpful. BTW what is dt?

/* One more way to solve this problem in java by using reasoning concept find day for given date. */

import java.io.; import java.util.; import java.text.; import java.math.; import java.util.regex.*;

public class Solution {

public static void main(String[] args) {
    Scanner in = new Scanner(System.in);
    String month = in.next();
    String day = in.next();
    String year = in.next();

    int n_month = Integer.parseInt(month);
    int n_day = Integer.parseInt(day);
    int n_year = Integer.parseInt(year);


    int mon[] = {0,3,3,6,1,4,6,2,5,0,3,5};
    int ye = 6;
    int total=0;
    if(n_year > 2000 && n_year < 3000)
        {
        int new_year = n_year % 2000;
        int new_year_rem = new_year /4;

         total = mon[n_month-1] + n_day + new_year + new_year_rem + ye;
   //     System.out.print(mon[n_month-1] +"  "+  n_day +"  "+ new_year +"  "+ new_year_rem +"  "+  ye);

    }

    int ch = total % 7;

    switch(ch)
       {
        case 0:
         {
             System.out.print("SUNDAY");
            break;
         }
        case 1:
         {
             System.out.print("MONDAY");
            break;
         }
        case 2:
         {
             System.out.print("TUESDAY");
            break;
         }
        case 3:
         {
             System.out.print("WEDNESDAY");
            break;
         }
        case 4:
         {
             System.out.print("THURSDAY");
            break;
         }
        case 5:
         {
             System.out.print("FRIDAY");
            break;
         }
        case 6:
         {
             System.out.print("SATURDAY");
            break;
         }

    } 
}

}

Very simple to understand.

Thanks

I am tryig the same in java 8 but its still not working can someone help me out

nice!!!!

its not working.

this code giving stderr as Exception in thread "main" java.time.DateTimeException: Invalid value for MonthOfYear (valid values 1 - 12): 2015 at java.time.temporal.ValueRange.checkValidValue(ValueRange.java:311) at java.time.temporal.ChronoField.checkValidValue(ChronoField.java:703) at java.time.LocalDate.of(LocalDate.java:267) at Solution.main(Solution.java:17)

please suggest correct code to clear error

Scanner in = new Scanner(System.in); int month = in.nextInt() - 1; int day = in.nextInt(); int year = in.nextInt();

    Date date = (new GregorianCalendar(year, month, day)).getTime();
    SimpleDateFormat f = new SimpleDateFormat("EEEE");
    String day2 = f.format(date);
    System.out.println(day2.toUpperCase());

I'm having an run time error while using this logic....can u help me.?

thank u.

But we can't use this answer here. can't import LocalDate....

Thanks :)

Tried this too. But your code and my code, both not working here on this challenge.

DateTimeFormatter formatter = DateTimeFormatter.ofPattern("dd/MM/yyyy");
		LocalDate date = LocalDate.parse(day + "/" + month + "/" + year, formatter);
		DayOfWeek dow = date.getDayOfWeek();  
		String output = dow.getDisplayName(TextStyle.SHORT, Locale.US);

Thanks Man!!!!!!!

thanks man.!

Thanks man helped lot

Not worked at all :(

It shows me Interface or Enum expected in main method!

its not working. can u explain this once????

I agree 100% we should use Java 8 time/date now. But there was an issue withe the task itself at least in my environment (iMac+Chrome): adding import statements is NOT allowed! I worked around by using qualified class names in my code:

public static String getDay(String day, String month, String year) {
    java.time.LocalDate localDate = java.time.LocalDate.of(Integer.valueOf(year), Integer.valueOf(month), Integer.valueOf(day));

    return localDate.getDayOfWeek().toString();

}

This worked for me in  java8. Write the below code inside the method
int dd = Integer.parseInt(day);
   int mm = Integer.parseInt(month);
   int yy = Integer.parseInt(year);
    LocalDate dt = LocalDate.of(yy,mm,dd);
   return dt.getDayOfWeek().name();

i think without solving you are giving sujjestion first do weather it is allowed or not

How to import localDate? Imports field is not editable.

The function needs to return a string but you are printing it right away.

how to return dt.getDayOfWeek() to string.

my code

import java.time.LocalDate;
import java.time.format.DateTimeFormatter;
public class Solution {
    public static String getDay(String day, String month, String year) {
        LocalDate ld = LocalDate.of(Integer.parseInt(year), Integer.parseInt(month), Integer.parseInt(day));
		DateTimeFormatter df = DateTimeFormatter.ofPattern("EEEE");
		String output = ld.format(df);
		return output.toUpperCase();
    }

how to write this program? i tryied to copy and paste but error!!!! how i solve this

wow thank you so much man , what a quick and brilliant solution ... lovely stuff mate

For those of you having trouble getting it to run here is the correct format:

public class Solution{
    
public static String getDay(String day, String month, String year){
    
    int dd = Integer.parseInt(day);
    int mm = Integer.parseInt(month);
    int yy = Integer.parseInt(year);
    
    LocalDate dt = LocalDate.of(yy, mm, dd);
    
    return dt.getDayOfWeek().toString();
}

compilation error saying that dt.getDayOfWeek() cant be converted to string;

Thank you!

Dude it's define snippet as String input how can you changes that to Integer?

Thank you so much this idea was really helpful

Nice ..... And time saving.

it is easy but it is not working

public static String findDay(int month, int days, int year) { Calendar c=Calendar.getInstance(); c.set(year,month-1,days); int i=c.get(Calendar.DAY_OF_WEEK);

String day = "";
switch(i){
case 1:
    day="SUNDAY";
    break;
case 2:
    day="MONDAY";
    break;
case 3:
    day="TUESDAY";
    break;
case 4:
    day="WEDNESDAY";
    break;
case 5:
    day="THURSDAY";
    break;
case 6:
    day="FRIDAY";
    break;
case 7:
    day="SATURDAY";
    break;
}
return day;
}

but it says that you can't import the java.time package

:D me too...

same here bro

Thank you for pointing that out! You saved me another hour of frustration. Hacker Rank should really make note of that.

Thanks it helped alot

Ughhh, thank you. My forehead would have far more keys stuck to it if it weren't for you.

Please explain the logic behind this calculation. I'm curious!

No APIs! Hell yes! :D

Based on the Wikipedia in Spanish :

private static final String[] DAYS = {"SUNDAY", "MONDAY","TUESDAY", "WEDNESDAY", "THURSDAY","FRIDAY","SATURDAY"};

    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int month = in.nextInt();
        int day = in.nextInt();
        int year = in.nextInt();

        int a = (14 - month) / 12;
        int y = year - a;
        int m = month + 12 * a - 2;
            
        int d = (day + y + y/4 - y/100 + y/400 + (31*m)/12) % 7;
        System.out.println(DAYS[d]);
    }

This is so fun and cool.

What's the point of using Java if you don't use the API's?

lol that's a bad-looking code however

Thank you very much for sharing ur solution!I found ur solution the most appropriate and accurate :)

thank you :)

does not work and gives some erro that,

Solution.java:2: error: package java.time does not exist import java.time.LocalDate; ^ Solution.java:2: error: package java.time does not exist import java.time.LocalDate; ^ Solution.java:9: error: cannot find symbol LocalDate date = LocalDate.of(y, m, d); ^ symbol: class LocalDate location: class Solution Solution.java:9: error: cannot find symbol LocalDate date = LocalDate.of(y, m, d); ^ symbol: variable LocalDate location: class Solution 3 errors

Showing Error

.java:4: error: class, interface, or enum expected public static String getDay(String day, String month, String year) { ^ .java:6: error: class, interface, or enum expected int m = Integer.valueOf(month); ^ .java:7: error: class, interface, or enum expected int y = Integer.valueOf(year); ^ .java:8: error: class, interface, or enum expected LocalDate date = LocalDate.of(y, m, d); ^ .java:9: error: class, interface, or enum expected return date.getDayOfWeek().toString(); ^ .java:10: error: class, interface, or enum expected } ^ .java:12: error: class, interface, or enum expected public static void main(String[] args) { ^ .java:14: error: class, interface, or enum expected String month = in.next(); ^ .java:15: error: class, interface, or enum expected String day = in.next(); ^ .java:16: error: class, interface, or enum expected String year = in.next(); ^ .java:18: error: class, interface, or enum expected System.out.println(getDay(day, month, year)); ^ .java:19: error: class, interface, or enum expected } ^ 12 errors

When I tried to run it and use findDay to replace getDay, this is the error from Java 8

Compile Message

Solution.java:41: error: incompatible types: int cannot be converted to String String res = Result.findDay(month, day, year); ^ Note: Some messages have been simplified; recompile with -Xdiags:verbose to get full output 1 error Exit Status

255

in US first day of the week is Sunday, in europe Monday

it has some errors when I run this code... about TestCase how do I fix this?

why u used (Integer.parseInt(month)-1) in place of Integer.parseInt(month)

Out of curiosity, why exactly do you have a -1 for the month and day parameter. Also why does Calendar.DAY_OF_WEEK need to fed into the cal.get() function?

Thanks!

Best solution ever. I didn't know that setTime works with Date format. Just Great!

Thanks for your note, I almost expend 2 hours because of that.

whats the point of these practices if you use built in methods

Because months are zero indexed, so Jan is 0

Why there is month-1? Why -1?

The constraints are information for you like a programmer, the input always satisfy the constraints