<TaskLifetimeList ml-is-active="">
<TaskLifetimes>
<TaskLifetime>...</TaskLifetime>
<TaskLifetime>...</TaskLifetime>
<TaskLifetime>...</TaskLifetime>
<TaskLifetime>
<Comments>
<![CDATA[
подготовить    ]]>
</Comments>
<IsPublic>True</IsPublic>
<Date>19.04.2018 13:00:19</Date>
<EditorId>9017</EditorId>
<Editor>ААААААААААААА</Editor>
<Executors>ВВВВВВВВВВ</Executors>
<ExecutorsGroup>БББББББББББ</ExecutorsGroup>
<Participants>АААААА</Participants>
<StatusId>35</StatusId>
</TaskLifetime>
<TaskLifetime>...</TaskLifetime>
<TaskLifetime>...</TaskLifetime>
</TaskLifetimes>
<Paginator>...</Paginator>
</TaskLifetimeList>

public List<Date> getDates() throws IOException, ParseException {
    SimpleDateFormat format = new SimpleDateFormat("dd.MM.yyyy HH:mm:ss");
    Document document = Jsoup.connect("some-url").get();

    Elements elements = document.select("TaskLifetimeList TaskLifetimes TaskLifetime");

    List<Date> dates = new ArrayList<>();
    for (Element item : elements) {
        if (item.select("ExecutorsGroup").size() > 0) {
            String stringDate = item.selectFirst("Date").text();
            dates.add(format.parse(stringDate));
        }
    }

    return dates;
}