javascript – ToDoList com data

// Create a "close" button and append it to each list item
var myNodelist = document.getElementsByTagName("LI");
var i;
for (i = 0; i < myNodelist.length; i++) {
  var span = document.createElement("SPAN");
  var txt = document.createTextNode("Remover");
  span.className = "close";
  span.appendChild(txt);
  myNodelist(i).appendChild(span);
}

// Click on a close button to hide the current list item
var close = document.getElementsByClassName("close");
var i;
for (i = 0; i < close.length; i++) {
  close(i).onclick = function() {
    var div = this.parentElement;
    div.style.display = "none";
  }
}


// Create a new list item when clicking on the "Add" button
function newElement() {
  var li = document.createElement("li");
  var inputValue = document.getElementById("myInput").value;
  var t = document.createTextNode(inputValue);
  li.appendChild(t);
  if (inputValue === '') {
    alert("Escreva algo!");
  } else {
    document.getElementById("myUL").appendChild(li);
  }
  document.getElementById("myInput").value = "";

  var span = document.createElement("SPAN");
  var txt = document.createTextNode("Remover");
  span.className = "close";
  span.appendChild(txt);
  li.appendChild(span);

  for (i = 0; i < close.length; i++) {
    close(i).onclick = function() {
      var div = this.parentElement;
      div.style.display = "none";
    }
  }

  var li = document.appendChild("li");
  var inputValueData = document.getElementById("myInputData").value;
  var tData = document.createTextNode(inputValueData);
  li.appendChild(tData);    
  if (inputValueData === '') {
    alert("Digite a data!");
  } else {
    document.getElementById("myUL").appendChild(li);
  }
  document.getElementById("myInputData").value = "";

  var span = document.createElement("SPAN");
  var txt = document.createTextNode("Remover");
  span.className = "close";
  span.appendChild(txt);
  li.appendChild(span);

  for (i = 0; i < close.length; i++) {
    close(i).onclick = function() {
      var div = this.parentElement;
      div.style.display = "none";
    }
  }
}

/* Include the padding and border in an element's total width and height */
* {
  box-sizing: border-box;
}

/* Remove margins and padding from the list */
ul {
  margin: 0;
  padding: 0;
}

/* Style the list items */
ul li {
  cursor: pointer;
  position: relative;
  padding: 12px 8px 12px 40px;
  background: #eee;
  font-size: 18px;
  transition: 0.2s;

  /* make the list items unselectable */
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  user-select: none;
}

/* Set all odd list items to a different color (zebra-stripes) */
ul li:nth-child(odd) {
  background: #f9f9f9;
}

/* Darker background-color on hover */
ul li:hover {
  background: #ddd;
}

/* When clicked on, add a background color and strike out text */
ul li.checked {
  background: #888;
  color: #fff;
  text-decoration: line-through;
}

/* Add a "checked" mark when clicked on */
ul li.checked::before {
  content: '';
  position: absolute;
  border-color: #fff;
  border-style: solid;
  border-width: 0 2px 2px 0;
  top: 10px;
  left: 16px;
  transform: rotate(45deg);
  height: 15px;
  width: 7px;
}

/* Style the close button */
.close {
  position: absolute;
  right: 0;
  top: 0;
  padding: 12px 16px 12px 16px;
}

.close:hover {
  background-color: #f44336;
  color: white;
}

/* Style the header */
.header {
  background-color: black;
  padding: 30px 40px;
  color: white;
  text-align: center;
}

/* Clear floats after the header */
.header:after {
  content: "";
  display: table;
  clear: both;
} 

/* Style the input */
#myInput {
  margin: 0;
  border: none;
  border-radius: 0;
  width: 500px;
  padding: 10px;
  float: left;
  font-size: 16px;
}

#myInputData {
  margin: 0;
  border: none;
  border-radius: 0;
  width: 500px;
  padding: 10px;
  float: left;
  font-size: 16px;
}


/* Style the "Add" button */
.addBtn {
  padding: 10px;
  width: 25%;
  background: #d9d9d9;
  color: #555;
  float: left;
  text-align: center;
  font-size: 16px;
  cursor: pointer;
  transition: 0.3s;
  border-radius: 0;
}

.addBtn:hover {
  background-color: #bbb;
}

<!DOCTYPE html>
<html lang="en">
 <head>
 <meta charset="UTF-8">
 <meta name="viewport" content="width=device-width, initial-scale=1.0">
 <title>Eventos</title>
 <link href="style.css" rel="stylesheet">
 </head>
 <body>
     
    <div id="myDIV" class="header">
        <h2>Agenda de Atividades</h2>
        <div id="inputs">
        <input type="text" id="myInput" placeholder="O que fazer?">
        <input type="date" id="myInputData">
        </div>
        <span onclick="newElement()" class="addBtn">Adicionar</span>
      </div>
      
      <ul id="myUL">
        <li>Bem vinda a lista da Ada!</li>
      </ul>
 </body>
 <script src="https://pt.stackoverflow.com/script.js"></script>
</html>