TZ variabvle not set from cron ksh jobs after DST change on Sunday morning

[ui05067]

m500261-clin_prod /home/hci $ `TZ=$TZ+848 date +%Y%m%d`
ksh: 20121106: not found.
m500261-clin_prod /home/hci $ echo $TZ
EST5EDT
m500261-clin_prod /home/hci $ date
Tue Nov 6 19:07:00 EST 2012

how come the first command does not yield a date of 31 days ago?


Stopped working after Daylight savings time 2 days ago November 5

 

[ui05067]

todays date is 11/07/2012
`TZ=$TZ+48 date +%Y%m%d` yields 20121107 ????

it should yield 20121105


TZ=EST5EDT

running AIX 6.1.0.0