me@mybox:~/sandbox
$ date ; ps -ef | grep zod
Tue Jul 19 12:36:08 EDT 2011
me        9267     1  0 Jul07 ?        00:00:00 time ./zod.pl
me        9268  9267 99 Jul07 ?        11-19:49:32 /usr/bin/perl ./zod.pl
me       12255 12193  0 12:36 pts/5    00:00:00 grep zod
me@mybox:~/sandbox
$ ps -o etime -p 9268
    ELAPSED
11-21:45:38