如何查找与当前日期比较的最新日期？

Question

I created a list for dates in certain format. In that list I'm adding elements from some HTML code. Also I get curent time in format same as in list.

List<WebElement> times = driver.findElements(By.tagName("time"));
String timeStamp = new SimpleDateFormat("MMM d, yyyy", Locale.ENGLISH).format(Calendar.getInstance().getTime());

System.out.println(timeStamp);
for (WebElement element: times) {
        System.out.println(element.getText());
    }

Now, how to get most recent passed date and compare with current date, because I must count how mach days have been passed?

Answer 1

You can do as follows :

• iterate over your elements
• parse them to LocalDate (set the good pattern in the formatter )
• keep only the ones in the past
• get the max
• print it

---

List<WebElement> times = driver.findElements(By.tagName("time"));

LocalDate now = LocalDate.now();

DateTimeFormatter formatter = DateTimeFormatter.ofPattern("MMMM d, yyyy", Locale.ENGLISH);

LocalDate mostRecent = times.stream()
            .map(webE -> LocalDate.parse(webE.getText(), formatter))
            .filter(date -> date.isBefore(now))
            .max(Comparator.comparingLong(LocalDate::toEpochDay))
            .orElseThrow(IllegalAccessException::new);

System.out.println(mostRecent);

---

LocalDate dateBefore;
LocalDate dateAfter;
long daysBetween = DAYS.between(dateBefore, dateAfter);

Answer 2

Try using TreeSet.floor() / TreeSet.ceiling().

https://www.tutorialspoint.com/java/util/treeset_floor.htm