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Difference between Year and Week year in SimpleDateFormat's pattern

Nick Widelec
Ranch Hand

Joined: Feb 28, 2013
Posts: 226

Directly from this API

"
y Year Year 1996; 96
Y Week year Year 2009; 09

"

I have tested those two keywords for creating patterns, and they produce the same result.
What do they mean by Week year in that context?




OCAJP 7, OCPJP 7
Henry Wong
author
Sheriff

Joined: Sep 28, 2004
Posts: 18103
    
  39

Nick Widelec wrote:Directly from this API

"
y Year Year 1996; 96
Y Week year Year 2009; 09

"

I have tested those two keywords for creating patterns, and they produce the same result.
What do they mean by Week year in that context?


A week year is a year where all the weeks in the year are whole weeks. This is specified by some standard (which I don't remember at the moment). Basically, this guarantees that a program working on a week's data will not transition between years. Unfortunately, this also means that the beginning of the year may not start on the first of January. What year a particular day belongs in depends on these rules, and of course, there are days where the year and the week year are different.

Henry


Books: Java Threads, 3rd Edition, Jini in a Nutshell, and Java Gems (contributor)
 
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