M41T81_YEAR
WRITERTC(sc, M41T81_YEAR, bintobcd(ymdhms->dt_year % 100));
ymdhms->dt_year = 1900 + bcdtobin(READRTC(sc, M41T81_YEAR));
WRITERTC(sc, M41T81_YEAR, bintobcd(ymdhms->dt_year % 100));
ymdhms->dt_year = 1900 + bcdtobin(READRTC(sc, M41T81_YEAR));