<td th:text="${#dates.format(new java.util.Date(activity.loggedTimestamp))}"></td>
參考: https://stackoverflow.com/a/38944477/1280694
如果要設置格式的話可以寫成
<span th:text="'Label of Date: ' + ${#dates.format(new java.util.Date(activity.loggedTimestamp), 'dd/MM/yyyy - HH:mm')}"></span>