RTC_YEAR
year = readrtc(RTC_YEAR) + readrtc(RTC_CENTURY) * 100;
year = readrtc(RTC_YEAR) + 1900;
writertc(RTC_YEAR, bin2bcd(y%100)); /* Write back Year */
rtcin(RTC_YEAR), rtcin(RTC_MONTH), rtcin(RTC_DAY),