US DST changes may require updating the JRE used in Web/App/Batch servers. More information can be found in these links
Do you think it will also impact peopletools release as well. I do not see any documents on this on customer connection. Please share your thoughts on this issue.
I think this PeopleSoft Page and associated data stored in PSTIMEZONE and PSDSTTIME must be updated. I have seen one other record PSTZOFFSET which may need to be updated, if you are using this in your environment. The data in this table is not required by peoplesoft and can be used in query to simplify the access to timezone data. This makes the time zone information available in a format that can be easily accessed with SQL. (Exception : May be used by Time and Labor. Check your installation). You may also want to update only for the period 2007 and onwards after applying the updated timezone information.
PeopleTools -> Utilities -> International -> TimeZones and Hit the button Generate Query Offsets and enter the start and end date for which you want to generate the information. This will delete the old data and enter the new data. You may want to update the data only for the year 2007 onwards only.
Here is a link to peoplebooks -> Unserstanding Time Zones
Navigation for PeopleTools 8.4x
PeopleTools -> Utilities -> International -> Time zones
Page: TIMEZONEDATA, DSTDATA
Record: PSTIMEZONE, PSDSTTIME
Here is the SQL to update the record.
INSERT INTO PSDSTTIME VALUES ( '2FirstSunNov', 'N', '11', 1, '0', 2, 0, 'First Sunday in Nov, 2:00am' )
INSERT INTO PSDSTTIME VALUES ( '22ndSunMar', 'N', '3', 2, '0', 2, 0, 'Second Sunday in March, 2:00am' )
UPDATE PSTIMEZONE SET DSTSTART='22ndSunMar' WHERE TIMEZONE IN ('AKST','CST','EST','MST','PST');
UPDATE PSTIMEZONE SET DSTEND='2FirstSunNov' WHERE TIMEZONE IN ('AKST','CST','EST','MST','PST');