12  1  2  3  4  5  6  7  8  9 10 11 : 0 1 2 3 4 5 0 1 2 3 4 5 6 7 8 9 : 0 1 2 3 4 5 0 1 2 3 4 5 6 7 8 9
The clock above does NOT require JavaScript, but uses CSS animations.