001100011000777777777777 030030003006777777777777 000200002000777777777777 004000004006777777777777 055550055500777777777777 000000000000777777777777 011110111000777777777777 030000000300777777777777 022200222000777777777777 000040000400777777777777 055500555000777777777777 000000000000777777777777 777777777777777777777777 777777777777777777777777 777777777777777777777777 777777777777777777777777 777777777777777777777777 777777777777777777777777 777777777777777777777777 777777777777777777777777 777777777777777777777777 777777777777777777777777 777777777777777777777777 777777777777777777777777 Arduino clock is apparently reasonably accurate. Why not use the (12x12) floor as a digital clock when we're not dancing on it? :-)