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Trying to change header date of a file

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# 8  
Old 04-24-2010
ksh93 include builtin properties, read my post some weeks ago.
Some examples about date calculation.
# 9  
Old 04-26-2010
Hi,

-d and -v both options are coming illegal for me.
I am working in ksh.
with -u option -> date -u 20080630 6 month ago +%Y%m%d
error coming like date: bad conversion
# 10  
Old 04-27-2010
Hi,

I have tried below steps-
D="20080531"
date -d "$D 6 month ago" +%Y%m%d

But an error is coming like Invalid option..
It means -d option is not working for me. I am working in ksh.
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