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NOTIFICATION : REMINDER FOR PASSAGE TO YEAR 2001: THE ATTENTION OF MEMBERS IS DRAWN TO THE FOLLOWING REGULATIONS IN FM 92 GRIB AND FM 94 BUFR: IN FM 92 GRIB, UNDER SECTION 1 - PRODUCT DEFINITION SECTION: NOTE (6): TO SPECIFY YEAR 2000, OCTET 13 OF THE SECTION (YEAR OF THECENTURY) SHALL CONTAIN A VALUE EQUAL TO 100 AND OCTET 25 OF THE SECTION (CENTURY OF REFERENCE TIME DATA)SHALL CONTAIN A VALUE EQUAL TO 20. TO SPECIFY YEAR 2001, OCTET 13 OF THE SECTION SHALL CONTAIN A VALUE EQUAL TO 1 AND OCTET 25 OF THE SECTION SHALL CONTAIN A VALUE EQUAL TO 21 (BY INTERNATIONAL CONVENTION, THE DATE OF 1 JANUARY 2000 IS THE FIRST DAY OF THE HUNDREDTH YEAR OF THE TWENTIETH CENTURY AND THE DATE OF 1 JANUARY 2001 IS
THE FIRST DAY OF THE FIRST YEAR OF THE TWENTY FIRST CENTURY); IT IS TO BE NOTED ALSO THAT YEAR 2000 IS A LEAP YEAR AND THAT 29 FEBRUARY 2000 EXISTS. IN FM 94 BUFR, UNDER SECTION 1 - IDENTIFICATION SECTION: NOTE (3): TO SPECIFY YEAR 2000, OCTET 13 OF THE SECTION (YEAR OF THECENTURY) SHALL CONTAIN A VALUE EQUAL TO 100. TO SPECIFY YEAR 2001, OCTET 13 OF THE SECTION SHALL CONTAIN A VALUE EQUAL TO 1 (BY INTERNATIONAL CONVENTION, THE DATE OF 1 JANUARY 2000 IS THE FIRST DAY OF THE HUNDREDTH YEAR OF THE TWENTIETH CENTURY AND THE DATE OF 1 JANUARY 2001 IS THE FIRST DAY OF THE FIRST YEAR OF THE TWENTY FIRST CENTURY); IT IS TO BE NOTED ALSO THAT YEAR 2000 IS A LEAP YEAR AND THAT 29 FEBRUARY 2000 EXISTS.
IN GRIB AND BUFR, THE CENTURY AND YEAR ARE CODED AS FOLLOWED: YEAR GRIB CENTURY ID BUFR AND GRIB YEAR ID 1998 20 98 1999 20 99 2000 20 100 2001 21 1 2002 21 2 SO AT 00 UTC ON 1ST JANUARY 2001, THE GRIB CENTURY WILL CHANGE FROM 20 TO 21, AND THE GRIB AND BUFR YEAR WILL CHANGE FROM 100 TO 1. /
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