Spring with Thymeleaf binding date in html form

I have a simple snippet of form like:

<form th:action="@{'/save'}" th:object="${account}" method="post">
    <div class="form-group">
        <label for="expirationDate">Expiration date</label>
        <input type="datetime-local" class="form-control" id="expirationDate"
               placeholder="Expiration date" th:field="*{expirationTime}"/>
    </div>
    <button type="submit" class="btn btn-primary">Submit</button>
</form>

I'm passing there a filled object account and expirationTime is a LocalDateTime field. The problem is that the expirationTime is not bind with the value passed to the form (object which is passed is 100% correct). Any idea why?