In the hwclock man page, this section:
...
       --version
              Print the version of hwclock on Standard Output.
              You need the following option if you specify  --set
              option.  Otherwise, it is ignored.

       --date=date_string
...
is wrong. The stuff starting at "You need..." should be a "header"
for the --date option. See other headers for groups of options for
example of how it should look.

Then move the --epoch option to follow --version so it is under the
proper header.