date conversion DD-MMM-YY to YYYYMMDD

Question

How to convert DD-MMM-YY to YYYYMMDD

I am in AIX, using korn shell.

neither date --date nor date -d works in aix.

Answer 1

I did it in perl, the hard way

sub formatDate_YYYYMMDD 
{
my $date=shift;
my ($day,$mon,$yr) = split /\-/,$date;
my @months=qw(JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC );
$i=0;
foreach $_ (@months)
    {
        $i++; 
        if (/$mon/i){$mon=$i;}
    }
$year=2000+$yr;
$mon=sprintf "%02d",$mon;
print "Invalid month format $date present in $file_name" if $mon ==0;
return("$year$mon$day");
}