LocalDateTime comparison with negative date time

Question

I have an issue on checking future date at the server. Since Date.parse() parse differently under chrome and Firefox. Under Firefox, a negative date time is passed to the server. Since I want to avoid this kind of browser problem, I tried to implement a validation on server side.

Date currentDate = new Date();
Date interviewingDate = interview.getInterviewingDate();
LocalDateTime currentDateTime = convertToLocalDateTime(currentDate);
LocalDateTime interviewingDateTime = convertToLocalDateTime(interview.getInterviewingDate());
DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss");
String formattedCurrentDateTime = currentDateTime.format(formatter);
String formattedInterviewDateTime = interviewingDateTime.format(formatter);

I tried to compare the server time with the case interviewing time. Since the future day is not allowed, if(interviewingDateTime.isAfter(currentDateTime)) return -1

But when I test it, the result is not I expected.

Here's some log:
currentDateTime.getTime() 1607592350160
interviewingDateTime.getTime() -125883137443000

formattedCurrentDateTime 2020-12-10 17:25:50
formattedInterviewDateTime 2021-12-03 13:55:00

currentDateTime toLocalDate 2020-12-10
interviewingDateTime toLocalDate -2020-12-03
interviewingDateTime.toLocalTime()13:55
currentDateTime.toLocalTime() 17:25:50.160

interviewingDateTime.isAfter(currentDateTime): false
interviewingDate.compareTo(currentDate): -1

I expect isAfter returns true since interviewing time is a future date. And I see there's negative value when I tried to output the local date and the original Date object getTime(). Is there anyway to convert the negative to back to normal positive date ? Or any other way to compare and check the date is future date as expected ?

Answer 1

Check your variable Date interviewDate before the conversion. if it's not a problem, Probally the issue is on method 'convertToLocalDateTime'. Try the simple code below.

public static LocalDateTime convertToLocalDateTime(Date date) {
    return date.toInstant()
               .atZone(ZoneId.systemDefault())
               .toLocalDateTime();  
}