> Currently it defaults to 64 bits on most architectures. Although it defaults to 32 bits on some traditional architectures (i686, ARM), this is planned to change and applications should not rely on this.

  #include <time.h>                                                                                                             
  #include <stdio.h>                                                                                                      
  int main() {                                                                                                                    
      printf("size: %lu\n", sizeof(time_t));                                                                                  
      return 0;                                                                                                       
  }