Why output other date?

Question

i have this code

public class HelloWorld{

 public static void main(String []args){
     try{
        java.util.Date mDate;
        java.text.SimpleDateFormat readFormat = new java.text.SimpleDateFormat("yyyy-mm-dd");
        mDate = readFormat.parse("2017-02-05");
        System.out.println("date: " + mDate.toString());
     } catch (java.text.ParseException e1) {
            e1.printStackTrace();
        }
     }

}

i expected output like Feb 05 00:02:00 UTC 2017

but im getting output Jan 05 00:02:00 UTC 2017 why? what's wrong in my code?

but why the output said January instead feb??? the string date is 2017-02-05 and the output its like 2017-01-05 — Carlos Alberto Blanco Vivas, Mar 27 '17 at 12:37
@Selvin I think the question is rather why `readFormat.parse("2017-02-05")` ends up in January. — Axel, Mar 27 '17 at 12:38
@Axel, probably because `Jan` is a first month in year in Gregorian Calendar, and is default value for any parsed date as a result. — M. Prokhorov, Mar 27 '17 at 12:39
Well, the question is actually: why is OP unwilling to read the documentation when he don't know the correct pattern? — Tom, Mar 27 '17 at 12:45
@CarlosAlbertoBlancoVivas Please search Stack Overflow before posting. This issue has been addressed *many* times already. Most any basic date-time issue has already been asked and answered. If you'd searched you would have found many examples of code you could have compared to yours to discover the problem of `MM` vs `mm`. — Basil Bourque, Mar 28 '17 at 01:14

score 5 · Answer 1 · answered Mar 27 '17 at 12:41

When you create this format: new java.text.SimpleDateFormat("yyyy-mm-dd"), that means

4-digit year
2-digit minute in hour
2-digit day in month

So "2017-02-05" is two minutes into the 5th day of 2017, and that's 5 of january.

You should use new java.text.SimpleDateFormat("yyyy-MM-dd"). See the documentation.

Why output other date?

1 Answers1