code: public static <D extends Comparable> DateTimeExpression<D> addDays(DateTimeExpression<D> date, int days) {
          return Expressions.dateTimeOperation(date.getType(), Ops.DateTimeOps.ADD_DAYS, date, ConstantImpl.create(days));
      }
docs: Add the given amount of days to the date
  
  @param date datetime
  @param days days to add
  @return converted datetime