update news, test count down

Author: Beikewzh

_data/news.yaml

@@ -5,20 +5,22 @@ upcoming_seminar:
   time_zones: "6 PM CET / 9 AM PT / 12 PM ET"
   speakers:
     - name: "Zhenyi Wang"
-      role: "PhD student in Deep Learning and Computer Vision at the University of Trento, "
-      link: "https://oatmealliu.github.io"
-      image: "/images/seminar/2025s3/mingxuanliu.jpg"
+      role: "Postdoctoral Associate at University of Maryland, College Park "
+      link: "https://joey-wang123.github.io"
+      image: "/images/seminar/2025s4/Zhenyi_Wang.jpg"
     - name: "Sijia Liu"
-      role: "PhD student in Computer Vision and Machine Learning in the Computer Vision Lab of Warsaw University of Technology."
-      link: "https://wysoczanska.github.io"
-      image: "/images/seminar/2025s3/Monika.jpeg"
+      role: "Assistant Professor at the CSE department of Michigan State University"
+      link: "https://lsjxjtu.github.io/index.html"
+      image: "/images/seminar/2025s4/sijia.png"
     - name: "Kairan Zhao"
-      role: "PhD student in Computer Vision and Machine Learning in the Computer Vision Lab of Warsaw University of Technology."
-      link: "https://wysoczanska.github.io"
-      image: "/images/seminar/2025s3/Monika.jpeg"
+      role: "PhD candidate in Machine Learning at the University of Warwick"
+      link: "https://kairanzhao.github.io"
+      image: "/images/seminar/2025s4/Kairan Zhao-min.png"
   registration_link: "https://stanford.zoom.us/meeting/register/2Iq30puITbydIGeuCtzrug"
 
 latest_news:
+  - date: "May 8, 2025"
+    text: "Our fourth seminar, held on May 8, 2025, showcased cutting‑edge Unlearning methodologies in continual learning—highlighting strategies for models to safely discard obsolete knowledge and adapt dynamically to evolving data streams."
   - date: "April 3, 2025"
     text: "Our third seminar introduced the innovative topic of Open-Vocabulary Learning, challenging conventional boundaries and sparking new research discussions."
   - date: "Mar 6, 2025"

_layouts/home.html

@@ -45,6 +45,16 @@ <h3 class="event-subtitle">{{ seminar.subtitle }}</h3>
           <p><strong>Date & Time:</strong> {{ seminar.date }}</p>
           <p><strong>Time Zones:</strong> {{ seminar.time_zones }}</p>
         </div>
+
+        <!-- Countdown Timer -->
+        <div class="event-countdown mb-4">
+          <h4>Starts in:</h4>
+          <div id="countdown-timer" class="h3"></div>
+          <button id="restart-countdown" class="btn btn-sm btn-outline-secondary mt-2">
+            Restart Countdown
+          </button>
+        </div>
+
         <div class="event-speakers mb-3">
           <h4>Speakers:</h4>
           {% for speaker in seminar.speakers %}
@@ -87,8 +97,6 @@ <h3 id="latest-news-title"><strong>Latest News</strong></h3>
   </div>
 </div>
 
-
-
 <!-- Services Strip (unchanged) -->
 <div class="strip">
   <div class="container pt-6 pb-6 pb-md-10">
@@ -145,3 +153,47 @@ <h2 class="feature-title">{{ feature.title }}</h2>
 </div>
 {% endif %}
 
+<!-- Countdown Script -->
+<script>
+document.addEventListener('DOMContentLoaded', () => {
+  // Parse seminar date and time (expects "YYYY-MM-DD HH:MM" format)
+  const seminarDate = new Date('{{ seminar.date | date: "%Y-%m-%d %H:%M" }}').getTime();
+  let target = seminarDate;
+
+  const timerEl   = document.getElementById('countdown-timer');
+  const restartBtn = document.getElementById('restart-countdown');
+  let intervalId;
+
+  function updateCountdown() {
+    const now  = Date.now();
+    const diff = target - now;
+
+    if (diff <= 0) {
+      timerEl.textContent = '🟢 Seminar is live!';
+      clearInterval(intervalId);
+      intervalId = null;
+      return;
+    }
+
+    const days    = Math.floor(diff / (1000 * 60 * 60 * 24));
+    const hours   = Math.floor((diff % (1000 * 60 * 60 * 24)) / (1000 * 60 * 60));
+    const minutes = Math.floor((diff % (1000 * 60 * 60))      / (1000 * 60));
+    const seconds = Math.floor((diff % (1000 * 60))           / 1000);
+
+    timerEl.textContent = 
+      `${days}d ${hours}h ${minutes}m ${seconds}s`;
+  }
+
+  restartBtn.addEventListener('click', () => {
+    target = seminarDate;
+    if (!intervalId) {
+      updateCountdown();
+      intervalId = setInterval(updateCountdown, 1000);
+    }
+  });
+
+  // Start ticking
+  updateCountdown();
+  intervalId = setInterval(updateCountdown, 1000);
+});
+</script>