code: public static final Function<Calendar,String> toStr(final DateStyle dateStyle, final TimeStyle timeStyle) {
          return new ToString(dateStyle, timeStyle);
      }
docs: <p>
  Converts the target Calendar into a String using the specified date ({@link DateStyle})
  and time ({@link TimeStyle}) styles.
  </p>
  
  @param dateStyle the date style to be used
  @param timeStyle the time style to be used
  @return the String representation of the Calendar.