Shell Programming and Scripting

Umm... that could return an invalid date when run at the end of a "long" month. For example, run date is 20071231, code returns 20061131

hi, thanks 4 the answers, but I could resolve in a better simple way :

in my main program I did :
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.
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hoje=`date +%Y%m%d`
data_13m=`expr ${hoje} - 10200`

export PAR_SCL3=${data_13m}

EXECUTA "sortcl /sp=${DIR_PROG_SCL}/saida_13meses.scl" \


and in the saida_13meses.scl I did :

/EXECUTE "$PAR_SCL3"
/INFILE=$PAR_SCL1
/FIELD=(CONTA_CORRENTE, POSITION=1, SIZE=13)
/FIELD=(NUMERO_FATURA, POSITION=14, SIZE=14)
/FIELD=(DATA_VENCIMENTO, POSITION=50, SIZE=10)
/CONDITION=(cond1, TEST=(DATA_VENCIMENTO > $PAR_SCL3 ))
/INCLUDE=(CONDITION=cond1)

bye

That shouldn't matter though, we don't want to know a nice calander date 13 months ago, we want to find stuff older than that to flag.