<header>
  <h2 class="title">Date.prototype.setDate()</h2>
  <p class="description">Встановлює день місяця для зазначеної дати.</p>
</header>
<main>
  <div class="result">
    <label for="day">Встановити день місяця (1-31):</label>
    <input type="number" id="day" min="1" max="31">
    <button onclick="setNewDay()">Застосувати</button>
    <p>Результат: <span id="outputDate"></span></p>
  </div>
</main>

body {
  font-size: 16px;
  line-height: 1.5;
  font-family: monospace;
}

header {
  background-color: #f1f1f1;
  margin-bottom: 25px;
  padding: 15px;
  -webkit-box-shadow: 0px 0px 3px 0px rgba(118, 118, 118, 1);
  -moz-box-shadow: 0px 0px 3px 0px rgba(118, 118, 118, 1);
  box-shadow: 0px 0px 3px 0px rgba(118, 118, 118, 1);
}

header h2.title {
  padding-bottom: 15px;
  border-bottom: 1px solid #999;
}

header p.description {
  font-style: italic;
  color: #222;
}

.result {
  background-color: #f8f8f8;
  padding: 15px;
  -webkit-box-shadow: 0px 0px 3px 0px rgba(118, 118, 118, 1);
  -moz-box-shadow: 0px 0px 3px 0px rgba(118, 118, 118, 1);
  box-shadow: 0px 0px 3px 0px rgba(118, 118, 118, 1);
}

button {
  margin-left: 10px;
  padding: 5px 10px;
  background-color: #4CAF50;
  color: white;
  border: none;
  cursor: pointer;
}

button:hover {
  background-color: #45a049;
}

const outputDateElem = document.getElementById("outputDate");

function setNewDay() {
  const dayInputValue = document.getElementById("day").value;
  const currentDate = new Date();
  currentDate.setDate(dayInputValue);
  outputDateElem.textContent = currentDate.toDateString();
}

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