Processing source code for a counter that displays seconds and 100ths of a second.

counter.pde

// A counter that displays seconds and 100ths of a second.
// By @marcedwards from @bjango.
// 
// You’ll need to use Tools › Create Font to convert a font file to a Processing .vlw file.
// Created using Processing 3.3.7.

PFont font;
float time = 0;

void draw() {
  background(0);
  fill(255);

  time = float(frameCount) / 30;

  text(nf(time, 2, 1), 10, 50);
  //render(400);
}

void setup() {
  size(200, 100, P2D);
  frameRate(30);
  smooth(8);
  font = loadFont("Lato-Semibold-48.vlw");
  textFont(font, 48);
  textAlign(LEFT);
}

// Render the animation to PNGs in foldername, then exit.
//
// The number of frames and path are optional.
// Do not include a trailing / in the folder name.

void render(int frames, String foldername) {
  saveFrame(foldername+"/frame####.png");
  if (frameCount==frames) {
    exit();
  }
}

void render(int frames) {
  render(frames, "render");
}

void render(String foldername) {
  render(100, foldername);
}

void render() {
  render(100, "render");
}