title: Bootstrap datetime picker option to select from every half hour
body: <p>Is there a way to make bootstrap datetime picker to show me only options that represent intervals of half hour? (8:00; 8:30; 9:00; 9:30; ...) </p>
  
  <p>Also I would like to know if there are ways to limit time intervals (say start from 8:00 AM until 18:00 PM).</p>