title: How to combine date and time?
body: <p>I am creating a Rails 3.2 app and I am not sure how to handle date and time.
  Right now I have a field in the database called start_date which is a datetime timestamp and I also have a field called start_time.</p>
  
  <p>I am using the fullcalendar plugin and for that to work I have to combine the start_date and start_time. How can I do this? (Not all events in the DB have a start_time).</p>
  
  <p>Thankful for all input!</p>