AS3722_RTC_START_YEAR
if (alrm->time.tm_year < (AS3722_RTC_START_YEAR - 1900))
rbuff[5] = bin2bcd(tm->tm_year - (AS3722_RTC_START_YEAR - 1900));
tm->tm_year = (AS3722_RTC_START_YEAR - 1900) + bcd2bin(rbuff[5] & 0x7F);
if (tm->tm_year < (AS3722_RTC_START_YEAR - 1900))