snipplets.dev/code/C/Transform/seconds_to_minutes_and_hours.c

#include <stdio.h>

int main(int argc, char const *argv[]) {
  unsigned int seconds = 800000 + 61;
  unsigned int minutes = seconds / 60;
  unsigned int hours = minutes / 60;

  printf("H: %d\nM: %d\nS: %d\n", hours, minutes % 60, seconds % 60);

  return 0;
}