dt->tm_wday = bcd2bin(buf[3]) - 1; /* 0 = Sun */
dt->tm_mday = bcd2bin(buf[4]);
dt->tm_mon = bcd2bin(buf[5] & 0x1f) - 1; /* 0 = Jan */
dt->tm_wday = bcd2bin(buf[3]) - 1; /* 0 = Sun */
dt->tm_mday = bcd2bin(buf[4]);
dt->tm_mon = bcd2bin(buf[5] & 0x1f) - 1; /* 0 = Jan */