string convertSecToDayHoMinSec(int sec) {
int day = sec / 86400;
int rem1 = sec % 86400;
int ho = rem1 / 3600;
int rem2 = rem1 % 3600;
int min = rem2 / 60;
int rem = rem2 % 60;
string s = day.ToString("00") + " Days, " + ho.ToString("00") + " Hours, " + min.ToString("00") + " Minutes, and " + rem.ToString("00") + " Seconds";
return s;
}