code: private void setupDateTimeInterpreter(final boolean shortDate) {
          mWeekView.setDateTimeInterpreter(new DateTimeInterpreter() {
              @Override
              public String interpretDate(Calendar date) {
                  SimpleDateFormat weekdayNameFormat = new SimpleDateFormat("EEE", Locale.getDefault());
                  String weekday = weekdayNameFormat.format(date.getTime());
                  SimpleDateFormat format = new SimpleDateFormat(" M/d", Locale.getDefault());
  
                  // All android api level do not have a standard way of getting the first letter of
                  // the week day name. Hence we get the first char programmatically.
                  // Details: http://stackoverflow.com/questions/16959502/get-one-letter-abbreviation-of-week-day-of-a-date-in-java#answer-16959657
                  if (shortDate)
                      weekday = String.valueOf(weekday.charAt(0));
                  return weekday.toUpperCase() + format.format(date.getTime());
              }
  
              @Override
              public String interpretTime(int hour) {
                  return hour > 11 ? (hour - 12) + " PM" : (hour == 0 ? "12 AM" : hour + " AM");
              }
          });
      }
docs: Set up a date time interpreter which will show short date values when in week view and long
  date values otherwise.
  @param shortDate True if the date values should be short.