linux\solaris + print specific date format from file

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http://serverfault.com – subject - print file date on solaris as format: yymmdd ( yy - year , mm - month , dd - day ) on Linux machine I type the following command in order to get: file date as the following: ls -l --time-style=+%Y%m%d /etc/hosts | awk '{print $6}' 20121107 . please advice what the syntax for Solaris ? , because I get error when I try to run it on Solaris: . ls -l --time-style=+%Y%m%d /etc/hosts ls: illegal option -- time-style=+%Y%m%d (HowTos)