the_modified_date function inconsistent with the_date

[gpoul]

the_modified_date function signature is not consistent with the_date function, but it would probably make sense for it to be.

Implementation was partially completed in ticket #2374, but is not consistent.

A consistent version would look something like the following:

function the_modified_date($d = '', $before='', $after='', $echo = true) {
       $the_modified_date .= $before;
       $the_modified_date .= apply_filters('the_modified_date', get_the_modified_date($d), $d);
       $the_modified_date .= $after;
       if ( $echo )
               echo $the_modified_date;
       else
               return $the_modified_date;
}

[Denis-de-Bernardy]

they serve different purposes.