IT25561: INCORRECT TIMEZONE INDICATOR WHEN DATES ARE CLOSE TO DST BOUNDARIES

APAR status

• Closed as program error.

Error description

• When a DateTime object is formatted for display, for example by
  CASTING CURRENT_TIME to a String, if the formatting pattern
  contains a timezone indicator and the current time is within +/-
  the raw GMT offset for that timezone away from a DST boundary
  then the timezone indicator may be incorrect.
  
  For example if the DST boundary is:
  
  2111-01-02 01:00:00 GMT
  
  And the local timezone is GMT+1 then between the following time
  the timezone indicator will incorrectly be calculated as GMT+2
  instead of GMT+1:
  
  2111-01-02 00:00:01 (GMT) 01:00:01 (local)
  2111-01-02 00:01:00 (GMT) 03:00:01 (local)
  
  The date and time is otherwise correct and the DST adjustment is
  applied correctly only the timestamp indicator is incorrect.
  

Local fix

• N/A
  

Problem summary

• ****************************************************************
  USERS AFFECTED:
  All users of IBM Integration Bus version 10 or App Connect
  Enterprise version 11.
  
  
  Platforms affected:
  MultiPlatform
  
  ****************************************************************
  PROBLEM DESCRIPTION:
  <span style="background-color:rgb(255, 255, 255)">When a
  DateTime object is formatted for display, for example by
  </span><span style="background-color:rgb(255, 255, 255)">CASTING
  CURRENT_TIME to a String, if the formatting pattern </span><span
  style="background-color:rgb(255, 255, 255)">contains a timezone
  indicator and the current time is within +/- </span><span
  style="background-color:rgb(255, 255, 255)">the raw GMT offset
  for that timezone away from a DST boundary  </span><span
  style="background-color:rgb(255, 255, 255)">then the timezone
  indicator may be incorrect.                  </span>
  <span style="background-color:rgb(255, 255, 255)">
  
  </span>
  <span style="background-color:rgb(255, 255, 255)">For example if
  the DST boundary is:                            </span>
  <span style="background-color:rgb(255, 255, 255)">
  
  </span>
  <span style="background-color:rgb(255, 255, 255)">2111-01-02
  01:00:00 GMT                                        </span>
  <span style="background-color:rgb(255, 255, 255)">
  
  </span>
  <span style="background-color:rgb(255, 255, 255)">And the local
  timezone is GMT+1 then between the following time </span><span
  style="background-color:rgb(255, 255, 255)">the timezone
  indicator will incorrectly be calculated as GMT+2 </span><span
  style="background-color:rgb(255, 255, 255)">instead of GMT+1:
                                               </span>
  <span style="background-color:rgb(255, 255, 255)">
  
  </span>
  <span style="background-color:rgb(255, 255, 255)">2111-01-02
  00:00:01 (GMT) 01:00:01 (local)                     </span>
  <span style="background-color:rgb(255, 255, 255)">2111-01-02
  00:01:00 (GMT) 03:00:01 (local)                     </span>
  <span style="background-color:rgb(255, 255, 255)">
  
  </span>
  <span style="background-color:rgb(255, 255, 255)">The date and
  time is otherwise correct and the DST adjustment is </span><span
  style="background-color:rgb(255, 255, 255)">applied correctly
  only the timestamp indicator is incorrect.  The problem is
  caused by an ambiguous conversion when formatting the
  timestamp.</span>
  

Problem conclusion

• When creating a DateTime object or a Time object using
  CURRENT_TIME or CURRENT_GMTTIMESTAMP the milliseconds since
  epoch are stored with the object. If this object remains
  unmodified then the milliseconds since epoch is used when
  formatting the object for display meaning ambiguous conversions
  during DST boundaries can not occur.
  
  ---------------------------------------------------------------
  The fix is targeted for delivery in the following PTFs:
  
  Version    Maintenance Level
  v10.0      10.0.0.20
  v11.0      11.0.0.8
  
  The latest available maintenance can be obtained from:
  http://www-01.ibm.com/support/docview.wss?rs=849&uid=swg27006041
  
  If the maintenance level is not yet available,information on
  its planned availability can be found on:
  http://www-1.ibm.com/support/docview.wss?rs=849&uid=swg27006308
  ---------------------------------------------------------------
  

Temporary fix

Comments

APAR Information

• APAR is sysrouted FROM one or more of the following:

• APAR is sysrouted TO one or more of the following:

Fix information

• Fixed component name

  INTEGRATION BUS

• Fixed component ID

  5724J0540

Applicable component levels