JDK-4985363 : Changing Date to String and String to Date back couse loss of One Year
  • Type: Bug
  • Component: core-libs
  • Sub-Component: java.text
  • Affected Version: 5.0
  • Priority: P3
  • Status: Closed
  • Resolution: Duplicate
  • OS: generic
  • CPU: generic
  • Submitted: 2004-01-29
  • Updated: 2004-01-30
  • Resolved: 2004-01-30
Related Reports
Duplicate :  
JDK-4267450 - (cal) API: Need public API to calculate, format and parse "year of week"
Description
Changing Date to String and String to Date back using simpleDateFormat causes loss of One Year. 

Steps to reproduce:
--------------------
1) Compile and run the attached test case.
2) The output will show Delta of -364 days.
Comments
EVALUATION The cause is execution order of Calendar.set() in SimpleDateFormat. ###@###.### 2004-01-30 The parse method sets the calendar field values in the order of items in the produced string "12-30-2002-Mon-04-07-50-089-AM-05-01-364-4-Monday-December" which includes multiple calendar fields. With the calendar field resolution rule, Calendar picks up WEEK_OF_YEAR and DAY_OF_WEEK. Monday of the 1st week of 2002 is December 31 2001. This is a known problem of GregorianCalendar that there's no way to specify week-based year numbers. I'm closing this bug as a duplicate of 4267450. ###@###.### 2004-01-30
30-01-2004