PNG_NUMBER_FORMAT_02u  726 png.c                APPEND_NUMBER(PNG_NUMBER_FORMAT_02u, (unsigned)ptime->hour);
PNG_NUMBER_FORMAT_02u  728 png.c                APPEND_NUMBER(PNG_NUMBER_FORMAT_02u, (unsigned)ptime->minute);
PNG_NUMBER_FORMAT_02u  730 png.c                APPEND_NUMBER(PNG_NUMBER_FORMAT_02u, (unsigned)ptime->second);
PNG_NUMBER_FORMAT_02u  163 pngerror.c              case PNG_NUMBER_FORMAT_02u: