void app_main(){
struct tm tsEpoch;
struct tm tsRTC;
struct timeval now;
struct timeval newt;
char LineClock[20] ={""};

int flag = 1;
unsigned int epoch = 1597833218;

newt.tv_sec= epoch;
tsEpoch = *localtime(&newt.tv_sec);
settimeofday(&newt, NULL);
gettimeofday(&now, NULL);

tsRTC ...