example of options you can pass to the day method

[chewmanfoo]

I need to highlight specific dates in a calendar_helper (some are to be blacked out on our calendar). So I need to do something like this:

  <% calendar.day(:day_method => :target_date) do |date, changes| %>
    <% if ScheduledBlackout.on_date(date).size > 0 %>
      <%= date.day  *options here to differentiate this day* %>
    <% else %>
      <%= date.day %>
    <% end %>

Can you tell me what kind of options the day method supports? Can I tell it which css class to render?