How many times?

//used for http://puzzling.stackexchange.com/questions/29323/how-many-times

public class Main {
    public static void main(String[] args) {
        int hours = 0, minutes = 0, seconds = 0;
        seconds++;
        while(!(hours == 0 && minutes == 0 && seconds == 0)) {
            seconds++;
            if (seconds == 60) {
                minutes++;
                seconds = 0;
            }
            if (minutes % 12 == 0 && seconds == 0) hours++;
            if (minutes == 60) minutes = 0;
            if (hours == 60) hours = 0;
            check(hours,minutes,seconds);
        }
    }

    private static void check(int hours, int minutes, int seconds) {
        int max = Math.max(Math.max(hours, minutes), seconds);
        int median = Math.max(Math.min(hours,minutes), Math.min(Math.max(hours,minutes),seconds));
        int min = Math.min(Math.min(hours, minutes), seconds);
        if (max == median + 20 && median == min + 20)
            System.out.println((hours-(hours%5))/5+":"+minutes+":"+seconds);
    }
}

//output:
//0:21:41
//0:43:23
//1:27:47
//1:49:29
//2:32:52
//2:54:34
//3:38:58
//3:59:39
//4:0:40
//4:43:3
//5:5:45
//5:49:9
//6:10:50
//6:54:14
//7:16:56
//7:59:19
//8:0:20
//8:21:1
//9:5:25
//9:27:7
//10:10:30
//10:32:12
//11:16:36
//11:38:18