Set start date and restrict dates in datepicker

I am trying to set start date to 14 days from today. Below 14 days date will not be selectable. I also need to lock the next 13 days as not selectable.

$('#sandbox-container input').datepicker({
  format: 'mm/dd/yyyy',
  keyboardNavigation: false,
  forceParse: false,
  startDate: new Date(),
  autoclose: true
<input type="text" name="productDate" id="productDate" class="form-control" maxlength="20" placeholder="Date" value="{{ date('m/d/Y',strtotime($productDate))}}">