code: public StringBuffer format(final Calendar calendar, final StringBuffer buf) {
          // do not pass in calendar directly, this will cause TimeZone of FastDatePrinter to be ignored
          return format(calendar.getTime(), buf);
      }
docs: /* (non-Javadoc)
  @see org.apache.commons.lang3.time.DatePrinter#format(java.util.Calendar, java.lang.Appendable)