Jeremy Keith adactio

## timestampComparison.js
// Generate a timestamp (in seconds) on the server. This won't change if the page is served from a cache.
var serverTimestamp = <?php echo time(); ?>;
// Create a new Date object from the local date and time on the client.
var localDate = new Date();
// Convert the local date and time to Universal Time (same as the server).
var localUTCString = localDate.toUTCString();
// Create a new Date object from the UTC date and time on the client.
var UTCDate = new Date(localUTCString);
// Generate a timestamp (in seconds) from the UTC date and time on the client.
var clientTimestamp = UTCDate.getTime() / 1000;

## beforeInstallPrompt.js
(function (win, doc) {
  win.addEventListener('beforeinstallprompt', function (e) {
    e.preventDefault();
    var deferredPrompt = e;
    var insertionPoint = doc.querySelector('main .contents');
    insertionPoint.insertAdjacentHTML('afterbegin',`
      <div class="feedback" role="dialog" aria-labelledby="homescreen">
      <h2 id="homescreen">Install The Session</h2>
      <p>Would you like to add The Session to your home screen?</p>
      <button class="back">No, thanks</button>

## trimCache.js
// Limit the number of items in a specified cache.
function trimCache(cacheName, maxItems) {
  caches.open(cacheName)
  .then( cache => {
    cache.keys()
    .then(keys => {
      if (keys.length > maxItems) {
        cache.delete(keys[0])
        .then( () => {
          trimCache(cacheName, maxItems)

## minimal-serviceworker.js
// Licensed under a CC0 1.0 Universal (CC0 1.0) Public Domain Dedication
// http://creativecommons.org/publicdomain/zero/1.0/

// HTML files: try the network first, then the cache.
// Other files: try the cache first, then the network.
// Both: cache a fresh version if possible.
// (beware: the cache will grow and grow; there's no cleanup)

const cacheName = 'files';

## playSparkline.js
// Licensed under a CC0 1.0 Universal (CC0 1.0) Public Domain Dedication
// http://creativecommons.org/publicdomain/zero/1.0/

// Pass in an array of numbers ranging from 0 to 20.

function playSparkline(notes) {
    if (!window.AudioContext && !window.webkitAudioContext) {
        return;
    }
    var playing = null;

## boilerplate.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title></title>
</head>
<body>

</body>

## monthmap.php
<?php

// Create an array of timestamps for posts
// and put them into an array called $timestamps.

foreach ($timestamps as $timestamp) {
    $day = date("j", $timestamp);
    $hour = date("G", $timestamp);
    if (isset($heatcalendar['posts'][$day][$hour])) {
        $heatcalendar['posts'][$day][$hour]++;

## linkTwitterProfiles.php
<?php

$string = preg_replace(
    '/(?<=^|\s)@([a-z0-9_]+)/i',
    '<a href="https://twitter.com/$1">@$1</a>',
    $string
);

?>

## yourdomain.com.conf
<VirtualHost *:80>
        ServerAdmin you@yourdomain.com
        ServerName yourdomain.com
        ServerAlias www.yourdomain.com
        DocumentRoot /path/to/yourdomain
        Redirect / https://yourdomain.com/
</VirtualHost>

<VirtualHost *:443>
        ServerAdmin you@yourdomain.com

## formProgress.js
// Licensed under a CC0 1.0 Universal (CC0 1.0) Public Domain Dedication
// http://creativecommons.org/publicdomain/zero/1.0/
(function (win, doc) {
    'use strict';
    if (!win.XMLHttpRequest || !win.FormData || !win.addEventListener || !doc.querySelectorAll) {
        // doesn't cut the mustard.
        return;
    }
    function hijaxForm (formElement) {
        var progressBar;