I have a time_select in which I am trying to set a time value as follows;

<%= f.time_select :start_time, :value => (@invoice.start_time ? @invoice.start_time : Time.now) %>

This always produces a time selector with the current time rather than the value for @invoice.start_time.

@invoice.start_time is in fact a datetime object but this is passed to the time selector just fine if I use

<%= f.time_select :start_time %>

I guess what I'm really asking is how to use the :value option with the time_select helper. Attempts like the following don't seem to produce the desired result;

<%= f.time_select :start_time, :value => (Time.now + 2.hours) %>
<%= f.time_select :start_time, :value => "14:30" %>