Using DateTimeFormatter on january first cause an invalid year value

Question

When i\'m using a DateTimeFormatter (code bellow) on a LocalDate set to January 1st 2017 i am ending with a wrong year value.

LocalDate.of(2017,1,1).toString         


        

Answer 1

Your are using the "wrong" year.

 Symbol  Meaning            Presentation    Examples  
 ------  -------            ------------    -------  
 y       year-of-era        year            2004; 04  
 Y       week-based-year    year            1996; 96

Source : DateTimeFormatter

This is basicly using the first day of the current week to see in what year it was instead of the actual day.

One of the issues is that this is Local dependant...

You should have used DateTimeFormatter.ofPattern("dd MMM yyyy").