Java Clock

// clock code, written by C.J. Winkler

void setup() {
  size(500, 500);
}

void draw() {
  background(255);

  // get the current time
  int s = second();  // values from 0 - 59
  int m = minute();  // values from 0 - 59
  int h = hour();    // values from 0 - 23

  // move origin to center of the screen
  translate(250, 250);

  // draw the seconds hand
  pushMatrix();
  rotate(radians(map(s, 0, 59, 0, 360)));
  stroke(255, 0, 0);
  strokeWeight(1);
  line(0, 0, 0, -225);
  popMatrix();

  // draw the minutes hand
  pushMatrix();
  rotate(radians(map(m + s / 60.0, 0.0, 60.0, 0.0, 360.0)));
  stroke(0, 0, 255);
  strokeWeight(5);
  line(0, 0, 0, -200);
  popMatrix();

  // draw the hours hand
  pushMatrix();
  if (h > 12) h -= 12;
  rotate(radians(map(h + m / 60.0, 0.0, 24, 0.0, 360.0)));
  strokeWeight(5);
  stroke(0, 255, 0);
  line(0, 0, 0, -100);
  popMatrix();

  // "button" at the center
  fill(0);
  noStroke();
  ellipse(0, 0, 15, 15);
}