Odd Behavior for datetime_select

I'm running into an odd situation where datetime_select is making the
hours into minutes and putting nothing in for hours. My database
table is mysql which looks like:

    create_table :my_sessions do |t|
      t.integer :user_id
      t.string :ssession_id
      t.date :start_date
      t.time :start_time
      t.time :end_time
      t.string :location
      t.string :title
      t.string :source
      t.boolean :msg_sent

      t.timestamps
    end

The View is standard scaffold:
<h1>Editing my_session</h1>
<% form_for (@my_session) do |f| %>
  <p>
    <%= f.label :ssession_id %><br />
    <%= f.text_field :ssession_id %>
  </p>
  <p>
    <%= f.label :start_date %><br />
    <%= f.date_select :start_date %>
  </p>
  <p>
    <%= f.label :start_time %><br />
    <%= f.datetime_select :start_time %>
  </p>
  <p>
    <%= f.label :end_time %><br />
    <%= f.datetime_select :end_time %>
  </p>
  <p>
    <%= f.label :location %><br />
    <%= f.text_field :location %>
  </p>
  <p>
    <%= f.label :title %><br />
    <%= f.text_field :title %>
  </p>
  <p>
    <%= f.submit "Update" %>
  </p>
<% end %>
<%= link_to 'Show', @my_session %> |
<%= link_to 'Back', my_sessions_path %>

My controller is:
  def update
    user = User.find(session[:user_id])
    @my_session = MySession.find(params[:id], :conditions =>
["my_sessions.user_id = ?", user.id])

    respond_to do |format|
      if @my_session.update_attributes(params[:my_session])
        flash[:notice] = 'MySession was successfully updated.'
        format.html { redirect_to(@my_session) }
        format.xml { head :ok }
      else
        format.html { render :action => "edit" }
        format.xml { render :xml => @my_session.errors, :status
=> :unprocessable_entity }
      end
    end
  end

The model is empty.

Again, if I view my edit page and the time that is returned from the
database is:
January 1, 2007, 13:45
I change it on the form to be:
January 1, 2007, 12:45
What gets stored is:
January 1, 2007, 1:12

When creating a new record the day gets set as the hour, the hour the
minute and the minute the seconds. Its really odd. Any help would be
great.

Thanks Matt

I've done some more playing around with this and it looks like if I
:include_seconds true the values update as expected. However, without
this it always shifts the values one to the right. My guess is that in
the code for the actionview helper it doesn't append :00 to the end of
the time.

Looking at the html generated code there is a new
my_session[start_time(6i)] name thats created. If I don't have the
include_seconds there is no hidden value for this on the page, which is
what I'm guessing is the cause of the problem.

I'm new to rails, who/how would I go about posting this as a possible
bug. Is there any other validation I should go about before posting it?

What Rails version are you using?