diff --git a/Chapter 13/countdown timer b/Chapter 13/countdown timer
deleted file mode 100644
index 25556ed..0000000
--- a/Chapter 13/countdown timer	
+++ /dev/null
@@ -1,101 +0,0 @@
-<!doctype html>
-<html>
-
-<head>
-    <title>JavaScript</title>
-    <style>
-        .clock {
-            background-color: blue;
-            width: 400px;
-            text-align: center;
-            color: white;
-            font-size: 1em;
-        }
-        
-        .clock > span {
-            padding: 10px;
-            border-radius: 10px;
-            background-color: black;
-        }
-        
-        .clock > span > span {
-            padding: 5px;
-            border-radius: 10px;
-            background-color: red;
-        }
-        
-        input {
-            padding: 15px;
-            margin: 20px;
-            font-size: 1.5em;
-        }
-    </style>
-</head>
-
-<body>
-    <div>
-        <input type="date" name="endDate">
-        <div class="clock"> <span><span class="days">0</span> Days</span> <span><span class="hours">0</span> Hours</span> <span><span class="minutes">0</span> Minutes</span> <span><span class="seconds">0</span> Seconds</span>
-        </div>
-    </div>
-    <script>
-        const endDate = document.querySelector("input[name='endDate']");
-        const clock = document.querySelector(".clock");
-        let timeInterval;
-        let timeStop = true;
-        const savedValue = localStorage.getItem("countdown") || false;
-        if (savedValue) {
-            startClock(savedValue);
-            let inputValue = new Date(savedValue);
-            endDate.valueAsDate = inputValue;
-        }
-        endDate.addEventListener("change", function (e) {
-            e.preventDefault();
-            clearInterval(timeInterval);
-            const temp = new Date(endDate.value);
-            localStorage.setItem("countdown", temp);
-            startClock(temp);
-            timeStop = true;
-        })
-
-        function startClock(d) {
-            function updateCounter() {
-                let tl = (timeLeft(d));
-                if (tl.total <= 0) {
-                    timeStop = false;
-                }
-                for (let pro in tl) {
-                    let el = clock.querySelector("." + pro);
-                    if (el) {
-                        el.innerHTML = tl[pro];
-                    }
-                }
-            }
-            updateCounter();
-            if (timeStop) {
-                timeInterval = setInterval(updateCounter, 1000);
-            }
-            else {
-                clearInterval(timeInterval);
-            }
-        }
-
-        function timeLeft(d) {
-            let currentDate = new Date();
-            let t = Date.parse(d) - Date.parse(currentDate);
-            let seconds = Math.floor((t / 1000) % 60);
-            let minutes = Math.floor((t / 1000 / 60) % 60);
-            let hours = Math.floor((t / (1000 * 60 * 60)) % 24);
-            let days = Math.floor(t / (1000 * 60 * 60 * 24));
-            return {
-                "total": t
-                , "days": days
-                , "hours": hours
-                , "minutes": minutes
-                , "seconds": seconds
-            };
-        }
-    </script>
-</body>
-
-</html>
