Rails - Mar 2005 - Time input with select_time

In MySQL I have a table named "game_times" with a time type field
named
"begin". I figured it would be straightforward to use
"select_time" to
get input in the view:

	<%= select_time(Time.now, :prefix => "game_time[begin]") %>

However, in the controller:

	@game_time = GameTime.new(@params["game_time"])

Doesn''t seem to work. Is there a simple way to do this that
I''m
overlooking?

I also read something about using the suffix *_at for field names. What 
does that buy you?