import calendar

[Gabrielle Linkherz]

I want to input a date, and i want to find out what's the day of that day.
Format : mmddyyy

Example : 10/23/2015
How ?

import java.util.Scanner;
public class DayCounter {
publi class static void main(String[] args) {
Scanner input = new Scanner(System.in);

System.out.print("Enter :");
String n =  input.nextLine();
        String d = n.substring(2,4);
        String m= n.substring(0,2);
        String y= n.substring(4,7);
}}

Then .. ?

[Knute Snortum]

Depends on the version of Java you're on. If it's version 8, try looking at this:

https://docs.oracle.com/javase/8/docs/api/java/time/LocalDate.html#of-int-int-int-

You would need to turn your Strings into integers.

[Campbell Ritchie]

If at all possible, only use the Java8 date classes (or something like Joda Time). They are much better than the older classes. What Knute showed you is an example; you can read a lot more about them in the Java™ Tutorials. You should be able to pass 23:10:15 and get 23rd October 2015. I expect the tutorial will tell you how.

Beware: if you use Scanner#nextLine() things can go horribly wrong if you have previously called its nextXXX methods. If anything nasty happens, start reading here.

[Carey Brown]

Why are you using three digits for the year?

[Campbell Ritchie]

And why did you write mmddyyy (where m does not mean month) in one place and 10/23/2015 with / / elsewhere?

[Molayo Decker]

Try this

import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Scanner;

public class DataCounter {

	public static void main(String[] args) {
 
    int dd;

    Scanner daydate = new Scanner(System.in);
    
    System.out.println("Please enter the Full Date-eg:1981 01 01:- ");
    dd = daydate.nextInt();
	
	int i = dd;Calendar cal=Calendar.getInstance();
	SimpleDateFormat dt = new SimpleDateFormat("EEEE,yyyy/MM/dd");
	//DateFormat dt = DateFormat.getInstance();
	String date = dt.format(i);
	System.out.println(date);
	}

}

[Gabrielle Linkherz]

Carey Brown wrote:Why are you using three digits for the year?

My mistakes. I meant yyy. Thanks

[Gabrielle Linkherz]

Molayo Decker wrote:Try this

import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Scanner;

public class DataCounter {

	public static void main(String[] args) {
 
    int dd;

    Scanner daydate = new Scanner(System.in);
    
    System.out.println("Please enter the Full Date-eg:1981 01 01:- ");
    dd = daydate.nextInt();
	
	int i = dd;Calendar cal=Calendar.getInstance();
	SimpleDateFormat dt = new SimpleDateFormat("EEEE,yyyy/MM/dd");
	//DateFormat dt = DateFormat.getInstance();
	String date = dt.format(i);
	System.out.println(date);
	}

}

Why your program showing Day of January 1st 1970, not from my input or your example?

[Gabrielle Linkherz]

Campbell Ritchie wrote:And why did you write mmddyyy (where m does not mean month) in one place and 10/23/2015 with / / elsewhere?

What do you mean? Well, if you're asking for my format, i did mean m : month, y : year, and so on. And when i used date format in excel, the format is month first. So, i think many people used this format, Don't they?

[Paul Clapham]

Gabrielle Linkherz wrote:Well, if you're asking for my format, i did mean m : month, y : year, and so on. And when i used date format in excel, the format is month first. So, i think many people used this format, Don't they?

Yes, a lot of people do that. And after they get strange results they post their question on a forum, where people tell them that "m" means "minute" and not "month" as far as DateFormat is concerned. It might also be a good idea for you to check the documentation for SimpleDateFormat to see what's the difference between "MM" and "MMM", and other useful things.

[Campbell Ritchie]

Gabrielle Linkherz wrote:. . . i did mean m : month, y : year, and so on. And when i used date format in excel, the format is month first. . . .

Paul C has already told you that Java® will not interpret m as month. The month‑day‑year format is usually used in the United #states, but other formats are in common use in other countries.

[Molayo Decker]

Hi Gabrielle,
Check the documentation on SimpleDateFormat http://docs.oracle.com/javase/8/docs/api/java/text/SimpleDateFormat.html. Have you tried changing the date format to start from month to year?

[Campbell Ritchie]

Better suggestion: stop using Calendar and its subclasses. Use LocalDate instead (Java8 only). More details in the Java™ Tutorials.