docs: public static Calendar endOfQuarter(Calendar calendar) {
  		calendar.set(Calendar.MONTH, calendar.get(DateField.MONTH.getValue()) / 3 * 3 + 2);
  		calendar.set(Calendar.DAY_OF_MONTH, calendar.getActualMaximum(Calendar.DAY_OF_MONTH));
  		return endOfDay(calendar);
  	}