YEAR0
dt->dt_year = bcdtobin(chiptime[MK_YEAR]) + YEAR0;
chiptime[MK_YEAR] = bintobcd(dt->dt_year - YEAR0);
dt->dt_year = chiptime[MC_YEAR] + YEAR0;
chiptime[MC_YEAR] = dt->dt_year - YEAR0;
sc->sc_year0 = YEAR0;
year = bcdtobin(year) + YEAR0;
year = bcdtobin(year) + YEAR0;
year = bcdtobin(year) + YEAR0;