MK_YEAR0
if (dt->dt_year > 100) dt->dt_year -= (MK_YEAR0 % 100);
dt->dt_year += MK_YEAR0;
chiptime[MK_YEAR] = TOBCD(dt->dt_year - MK_YEAR0) << 24;
if (t->Year > 100) t->Year -= (MK_YEAR0 % 100);
t->Year += MK_YEAR0;