float seconds = 0;  // this ensures floating-point divisions

void setup() {  
  size(400,400);
  frameRate(60);
}

void drawNumbers() {
  pushMatrix();
  pushStyle();
  fill(0);
  for (int h=0; h < 12; h++) {
    ellipse(0,-130,10,10);
    rotate(TWO_PI/12);
  }
  popMatrix();
  popStyle();
}

void draw() {
  seconds++;
  
  background(204);
  ellipse(200,200,300,300); // white clock face
  translate(200,200);

  drawNumbers();
  
  // second hand
  pushMatrix();
  rotate(TWO_PI*seconds/60);  // 60 seconds around the clock
  line(0,0,0,-130);
  popMatrix();
  
  // minute hand
  pushMatrix();
  rotate(TWO_PI*seconds/3600); // 60 minutes = 3600 seconds
  line(0,0,0,-100);
  popMatrix();
  
  // hour hand
  pushMatrix();
  rotate(TWO_PI*seconds/43200); // 12 hours = 43200 seconds 
  line(0,0,0,-80);
  popMatrix();
}