AIX Time Zone (TZ variable) defect (SMIT defect)
AFFECTED SYSTEMS: AIX 4.3.3 ML9 and ML10, AIX 5.1 and AIX 5.2
APARs: IY34798 (AIX 4.3), IY34203 (AIX 5.1), IY35629 (AIX 5.2). 

PROBLEM: 
   If smitty was used for chtz between, then TZ was appended with `,,`
   This prevents Daylight Savings from being processed
   As such, many systems did not `fall back` at 2am sunday 10/27/2002

NOTE: If there are no commas, then there should be no problem;
   however, the APAR should be applied to prevent future problems

REPRODUCE THE PROBLEM:
   smitty chtz
   daylight savings
   blank out all fields, and fill in time zone
   Apply the settings by pressing enter
   reboot
   `echo $TZ` will now show 2 commas on the end

TO VERIFY DEFECT:
   `echo $TZ` and `grep TZ /etc/environment`
   will show 2 commas on the end

FIX: 
   chtz 'CST6CDT'
   reboot
   apply APAR to correct SMIT defect

NOTE: if reboot is not done, cron and other daemons, plus
   other processes and kernel threads may be incorrect.
   they may cause a whole slew of problems.

NOTE: If time changed manually, then change it back before running chtz

NOTE: If not fixed becore chtz/reboot, then correct time and reboot

TO VERIFY FIX:
   Logout and login
      date will show proper time, and TZ will be correct