code: public int[] getPartialValues(ReadablePartial fieldSource, Object object, Chronology chrono, DateTimeFormatter parser) {
          if (parser.getZone() != null) {
              chrono = chrono.withZone(parser.getZone());
          }
          long millis = parser.withChronology(chrono).parseMillis((String) object);
          return chrono.get(fieldSource, millis);
      }
docs: Extracts the values of the partial from an object of this converter's type.
  This method checks if the parser has a zone, and uses it if present.
  This is most useful for parsing local times with UTC.
  
  @param fieldSource  a partial that provides access to the fields.
  This partial may be incomplete and only getFieldType(int) should be used
  @param object  the object to convert
  @param chrono  the chronology to use, which is the non-null result of getChronology()
  @param parser the parser to use, may be null
  @return the array of field values that match the fieldSource, must be non-null valid
  @throws ClassCastException if the object is invalid
  @throws IllegalArgumentException if the value if invalid
  @since 1.3