|24-25||Number of Tens of Thousands of Years of Offset|
(1) The year can be recovered with the formula:
Year(real/decoded) = Year + 10000 x offset
(2) Years before year 1 shall be coded as defined in ISO 8601 (year 1 is followed by year 0). If applicable, year-1 or before shall be indicated by setting the most significant bit of octets 13-14 and 24-25 to "1" in accordance with Regulation 92.1.5.