In my last post I told you what to do about the flicker. When it changes the flicker it still is showing the temperature stuff?
If you don't want it to start in temp mode can you not guess what to change to make it start in RTC mode?
int rtcMode;
This gets an initial value of 0 since you aren't specifying a value. When it is 0 it displays temp. When it is 1 it displays time.