<form action="https://cs12.net/form/submit.php" method="post">
  <fieldset>
    <legend>Date and Time </legend>
    <p>Date
    </p>
    <p>
      <input type="date" name="my_date" />

    </p>
    <p>Datetime-local
    </p>
    <p>
      <input type="datetime-local" name="my_datetime" />

    </p>
    <p>Time
    </p>
    <p>15 minute steps:
      <input type="time" name="my_time_15" step="900" value="12:00" />

    </p>
    <p>1 minute steps:
      <input type="time" name="my_time_1" step="60" value="12:00" />

    </p>
    <p>1 second steps:
      <input type="time" name="my_time_1s" step="1" value="12:00" />

    </p>
  </fieldset>
  <p>
    <button type="submit">Submit </button>
  </p>
</form>