[ruby-core:32907] WIN32OLE VT_DATE handling bug

I have found a problem with some date handling via the WIN32OLE API. Unfortunately I don't know how to provide a reproducible case because the COM program is proprietary, so I'm looking for guidance on how to file this bug.

Description
The problem is exposed at the turnover from 23:59:00 to the start/midnight of the next day. First the code, then the output:

  # requested objects for a time range "2010/10/25 23:59" to "2010/10/26 00:01"
  objects.each do |obj|
    puts "#{obj.timestamp}, #{obj.timestamp.class}"
  end

MRI 1.9.1-p430 (via RubyInstaller) produces:

2010/10/25 23:59:00, String
2010/10/25 00:00:00, String
2010/10/26 00:01:00, String


Under JRuby 1.5.1 using the very same code and the new jruby-win32ole support, it produces the correct output.

Mon Oct 25 23:59:00 -0500 2010, Time
Tue Oct 26 00:00:00 -0500 2010, Time
Wed Oct 26 00:01:00 -0500 2010, Time


It looks to me like the MRI WIN32OLE code is mishandling the COM VT_DATE time conversion.

In the absence of a reproducible case, how should I write this bug report?

cr