What was wrong with the clocks?

For instance, when the two middle clocks were at about the 10:30 position, they would immediately skip forwards to the 12:00 position. They would behave erratically, and sometimes rapidly advance through several positions. They reminded me of Mr. Burns in The Simpsons, having so many ailments they canceled each other out to a semblance of normality.

Seconds, minutes, hours, and days are divided into eight parts (0-7 for each value). The code for determining to advance a clock used

        if (g == 3 && Hour == 7) {
            change = 1;
        } else if (g == 2 && Min == 7) {
            change = 1;
        } else if (g == 1 && Sec == 7) {
            change = 1;
        } else if (g == 0) {
            change = 1;
        }

So the Day advances when the hour is 7. Not when it's 7 hours, 7 minutes, and 7 seconds; it advances at 7 hours and 1 second. Likewise for the hour. But there's more: the switch statement for advancing the time starts with days and proceeds through seconds. However, the case statements have no call to break; so whenever the day advanced, it would also advance the hour, minute, and second hands, etc. Therein lies the danger of switch statements.