binary_clock.c

#include <time.h>
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>

char *o(t) {
    char* string = malloc(5 * sizeof(char));
    int i;
    for(i=5;i>=0;i--) {
        char on = ((t & 1<<i)==1<<i)?'o':'-';
        string[5-i] = on;
    }
    return string;
}

int main() {
    while(1) {
        time_t nowTime = time(NULL);
        struct tm *now = localtime(&nowTime);
        
        printf("H:\t");
        char* hr = o(now->tm_hour);
        printf("%s", hr);
        free(hr);
        
        printf("\nM:\t");
        char* mn = o(now->tm_min);
        printf("%s", mn);
        free(mn);
        
        printf("\nS:\t");
        char* sc = o(now->tm_sec);
        printf("%s", sc);
        free(sc);
        
        printf("\n\033[3A");
        
        sleep(1);
    }
    return 0;
}

binary_clock.php

<?php

date_default_timezone_set('Europe/Dublin');

function o($v) {
    for($i=5;$i>=0;$i--) {
        echo (($v & (1<<$i))===(1<<$i))?'o':'-';
    }
    echo "\n";
}

while(true){
    $now = new DateTime();
    $hour = (int) $now->format("h");
    $min = (int) $now->format("i");
    $sec = (int) $now->format("s");
    
    echo "H:\t";o($hour);
    echo "M:\t";o($min);
    echo "S:\t";o($sec);
    echo "\033[3A";
    sleep(1);
}

binary_clock.rb

require 'date'

def o(time)
  for i in 0..5
    printf "%s", ((time & 1<<(5-i))===1<<(5-i)) ? 'o' : '-'
  end
  printf "\n"
end

while true do
  printf "H:\t"
  o(DateTime.now().hour)
  printf "M:\t"
  o(DateTime.now().minute)
  printf "S:\t"
  o(DateTime.now().second)
  printf "\n\033[4A"
  sleep 1
end