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setting date variable to be yesterday's date in Perl AIX

Actually I have sh script which sets the following variable:

TDATE=`date +%Y%m%d`

We then use this variable to set another variable:

CSFILE="test$TDATE"

I need help setting the TDATE variable to be yesterday's date.

This is very important, vendor switched when they send their file and it is always a day behind, example of a file they send would be: test20060706.txt

I am giving 500 points for this answer.
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mhorrocks
Asked:
mhorrocks
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1 Solution
 
Adam314Commented:
Is this perl, or an sh script?

If it's an sh script: You might be more answers in the OS->Unix topic area, or maybe OS->Linux.

If it's a perl script, you could use the strftime to format the time
See here for more info:
http://perldoc.perl.org/POSIX.html
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mhorrocksAuthor Commented:
Ok.  I need to delete this question and I will submit it under Unix SH scripting.

please delete this question and return the points.
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Adam314Commented:
To delete the question you need to post a question in community support ("Help" link at top-right of page)
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ozoCommented:
in Perl:
$TDATE=strftime"%Y%m%d", localtime time-24*60*60; #this may not be quite right for an hour near midnight when there is a daylight savings switchover

in unix sh, if your date command supports it:
TDATE= `date --date yesterday "+%Y%m%d"`
or if your version of unix can handle the appropriate  timezone offsets
TDATE=`TZ=+24 date +%y%m%d`
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