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Countdown

Countdown timers to upcoming events with days/hours/minutes/seconds.

other
46 downloads

By Lucas

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name: Countdown description: "Countdown timers to upcoming events with days/hours/minutes/seconds." category: other connections: [] version: 1

What it does

Live countdown timers to events you care about. Add an event with a name and date/time and watch days, hours, minutes, and seconds tick down in real time. Multiple events are listed soonest-first, events that have passed show a "passed" state with elapsed time, and you can remove individual events or clear all passed ones. Ships with a fictional far-future demo event (Harbor Lights Festival, 2027-07-04) so you can see it ticking immediately.

Setup

  • Open app.html in any browser (double-click the file works; no server needed)
  • Events are stored in the browser's localStorage — no account needed
  • Add an event: type a name, choose a date/time with the picker, press Add countdown
  • Counters tick every second; events in the past display as passed
  • Use Remove on an event to delete it, or Clear passed to remove all past events

Source

app.html — the complete app (single self-contained file: HTML, CSS, and JavaScript, no external dependencies):

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Countdown</title>
<style>
  :root{
    --bg:#101828;
    --bg2:#16213a;
    --card:#1b2742;
    --ink:#f2f5fb;
    --muted:#9aa7c2;
    --accent:#4cc2ff;
    --accent-soft:rgba(76,194,255,.14);
    --gold:#ffd166;
    --line:#2a3a5e;
  }
  *{box-sizing:border-box}
  body{
    margin:0;
    font-family:system-ui,-apple-system,"Segoe UI",sans-serif;
    background:linear-gradient(160deg,var(--bg),var(--bg2));
    color:var(--ink);
    min-height:100vh;
    -webkit-text-size-adjust:100%;
  }
  .wrap{max-width:620px;margin:0 auto;padding:24px 16px 64px}
  header{text-align:center;margin-bottom:22px}
  header h1{font-size:2rem;margin:0 0 6px;letter-spacing:1px}
  header h1 .dot{color:var(--gold)}
  header p{color:var(--muted);margin:0}
  .card{
    background:var(--card);
    border:1px solid var(--line);
    border-radius:14px;
    padding:18px;
    margin-bottom:16px;
  }
  .card h2{font-size:1.05rem;margin:0 0 12px;color:var(--gold)}
  label{display:block;font-size:.82rem;color:var(--muted);margin:10px 0 6px}
  input[type="text"],input[type="datetime-local"]{
    width:100%;
    font-family:inherit;
    font-size:1rem;
    color:var(--ink);
    background:var(--bg);
    border:1px solid var(--line);
    border-radius:8px;
    padding:10px 12px;
    color-scheme:dark;
  }
  input:focus{outline:2px solid var(--accent);border-color:var(--accent)}
  button{
    font-family:inherit;
    font-size:.95rem;
    font-weight:600;
    border:none;
    border-radius:8px;
    padding:10px 18px;
    cursor:pointer;
    background:var(--accent);
    color:#0b1220;
  }
  button:hover{filter:brightness(1.08)}
  button.ghost{background:transparent;color:var(--muted);border:1px solid var(--line)}
  button.ghost:hover{color:var(--ink);border-color:var(--muted)}
  button.danger{background:transparent;color:#ff8f8f;border:1px solid #5e2a2a}
  button.danger:hover{background:#3a1d1d}
  .row{display:flex;gap:10px;align-items:center;flex-wrap:wrap;margin-top:14px}
  .error{color:#ff9c9c;font-size:.88rem;margin-top:8px;min-height:1.2em}

  .event{
    border:1px solid var(--line);
    border-radius:12px;
    padding:16px;
    margin-bottom:14px;
    background:var(--accent-soft);
  }
  .event.passed{background:rgba(255,255,255,.02);opacity:.75}
  .event-head{display:flex;align-items:flex-start;gap:10px}
  .event-name{font-size:1.15rem;font-weight:700;margin:0;flex:1;line-height:1.3}
  .event-date{color:var(--muted);font-size:.85rem;margin:6px 0 12px}
  .timer{display:flex;gap:10px;flex-wrap:wrap}
  .unit{
    flex:1 1 0;
    min-width:64px;
    text-align:center;
    background:rgba(0,0,0,.28);
    border:1px solid var(--line);
    border-radius:10px;
    padding:10px 4px;
  }
  .unit .n{font-size:1.7rem;font-weight:800;font-variant-numeric:tabular-nums;color:var(--accent);display:block}
  .event.passed .unit .n{color:var(--muted)}
  .unit .l{font-size:.72rem;text-transform:uppercase;letter-spacing:1px;color:var(--muted)}
  .elapsed-note{color:var(--gold);font-size:.9rem;margin:4px 0 0;font-style:italic}
  .empty{color:var(--muted);text-align:center;padding:22px 0;font-style:italic}
  .sort-row{font-size:.82rem;color:var(--muted);margin:0 0 10px;text-align:right}
</style>
</head>
<body>
<div class="wrap">
  <header>
    <h1>COUNT<span class="dot">DOWN</span></h1>
    <p>Every second brings it closer.</p>
  </header>

  <div class="card">
    <h2>Add an event</h2>
    <label for="eventName">Event name</label>
    <input type="text" id="eventName" maxlength="80" placeholder="e.g. Weekend road trip">
    <label for="eventDate">Date &amp; time</label>
    <input type="datetime-local" id="eventDate">
    <div class="error" id="formError"></div>
    <div class="row">
      <button type="button" onclick="addEvent()">Add countdown</button>
      <button type="button" class="ghost" onclick="clearPassed()">Clear passed</button>
    </div>
  </div>

  <div class="sort-row">Sorted by date — soonest first</div>
  <div id="eventList"></div>
  <div class="empty" id="emptyMsg">No countdowns yet. Add your first event above.</div>
</div>

<script>
(function(){
  "use strict";
  var STORAGE_KEY = "countdown.events.v1";

  function $(id){ return document.getElementById(id); }

  function loadEvents(){
    var raw;
    try { raw = JSON.parse(localStorage.getItem(STORAGE_KEY) || "[]"); }
    catch (e) { raw = []; }
    if (!Array.isArray(raw)) return [];
    return raw.filter(function(ev){
      return ev && typeof ev.name === "string" && typeof ev.ts === "number" && !isNaN(ev.ts);
    });
  }
  function saveEvents(events){
    try { localStorage.setItem(STORAGE_KEY, JSON.stringify(events)); }
    catch (e) { /* storage unavailable */ }
  }

  var events = loadEvents();

  // Seed a single fictional demo event if the list is empty (first run).
  if (events.length === 0) {
    events.push({
      id: "seed-harbor-lights",
      name: "Harbor Lights Festival",
      ts: new Date(2027, 6, 4, 20, 0, 0).getTime()
    });
    saveEvents(events);
  }

  function pad(n){ return (n < 10 ? "0" : "") + n; }

  function formatEventDate(ts){
    return new Date(ts).toLocaleString(undefined, {
      weekday: "short", year: "numeric", month: "short",
      day: "numeric", hour: "2-digit", minute: "2-digit"
    });
  }

  function breakdown(ms){
    var total = Math.max(0, Math.floor(ms / 1000));
    var days = Math.floor(total / 86400);
    var hours = Math.floor((total % 86400) / 3600);
    var mins = Math.floor((total % 3600) / 60);
    var secs = total % 60;
    return { days: days, hours: hours, mins: mins, secs: secs };
  }

  window.addEvent = function(){
    var name = $("eventName").value.trim();
    var raw = $("eventDate").value;
    var err = $("formError");
    err.textContent = "";
    if (name === "") { err.textContent = "Give the event a name."; return; }
    if (!raw) { err.textContent = "Pick a date and time."; return; }
    var ts = new Date(raw).getTime();
    if (isNaN(ts)) { err.textContent = "That date could not be understood."; return; }
    events.push({ id: "ev-" + Date.now() + "-" + Math.floor(Math.random() * 1e6), name: name, ts: ts });
    saveEvents(events);
    $("eventName").value = "";
    $("eventDate").value = "";
    render();
  };

  window.removeEvent = function(id){
    events = events.filter(function(ev){ return ev.id !== id; });
    saveEvents(events);
    render();
  };

  window.clearPassed = function(){
    var now = Date.now();
    var hadPassed = events.some(function(ev){ return ev.ts < now; });
    if (!hadPassed) return;
    if (!window.confirm("Remove all events that have already passed?")) return;
    events = events.filter(function(ev){ return ev.ts >= now; });
    saveEvents(events);
    render();
  };

  function render(){
    var list = $("eventList");
    list.innerHTML = "";
    var now = Date.now();
    var sorted = events.slice().sort(function(a, b){ return a.ts - b.ts; });
    $("emptyMsg").style.display = sorted.length ? "none" : "block";
    sorted.forEach(function(ev){
      var card = document.createElement("div");
      var passed = ev.ts < now;
      card.className = "event" + (passed ? " passed" : "");
      card.id = "evcard-" + ev.id;

      var head = document.createElement("div");
      head.className = "event-head";
      var h = document.createElement("h3");
      h.className = "event-name";
      h.textContent = ev.name;
      var del = document.createElement("button");
      del.type = "button";
      del.className = "danger";
      del.textContent = "Remove";
      del.setAttribute("data-id", ev.id);
      del.onclick = function(){ window.removeEvent(ev.id); };
      head.appendChild(h);
      head.appendChild(del);

      var date = document.createElement("div");
      date.className = "event-date";
      date.textContent = formatEventDate(ev.ts);

      var timer = document.createElement("div");
      timer.className = "timer";

      var diff = Math.abs(ev.ts - now);
      var parts = breakdown(diff);
      var units = [
        [String(parts.days), "days"],
        [pad(parts.hours), "hours"],
        [pad(parts.mins), "min"],
        [pad(parts.secs), "sec"]
      ];
      units.forEach(function(u){
        var box = document.createElement("div");
        box.className = "unit";
        var n = document.createElement("span");
        n.className = "n";
        n.textContent = u[0];
        var l = document.createElement("span");
        l.className = "l";
        l.textContent = u[1];
        box.appendChild(n);
        box.appendChild(l);
        timer.appendChild(box);
      });

      card.appendChild(head);
      card.appendChild(date);
      if (passed) {
        var note = document.createElement("p");
        note.className = "elapsed-note";
        note.textContent = "This event has passed.";
        card.appendChild(note);
      }
      card.appendChild(timer);
      list.appendChild(card);
    });
  }

  function tick(){
    var now = Date.now();
    events.forEach(function(ev){
      var card = document.getElementById("evcard-" + ev.id);
      if (!card) return;
      var nums = card.querySelectorAll(".unit .n");
      if (nums.length < 4) return;
      var diff = Math.abs(ev.ts - now);
      var parts = breakdown(diff);
      var vals = [String(parts.days), pad(parts.hours), pad(parts.mins), pad(parts.secs)];
      for (var i = 0; i < 4; i++) { nums[i].textContent = vals[i]; }
      // flip to passed state if it just crossed
      if (ev.ts < now && card.className.indexOf("passed") === -1) {
        render();
      }
    });
  }

  render();
  setInterval(tick, 1000);
})();
</script>
</body>
</html>

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