Time conversion from seconds to date issue

Question

I have the following Long variable holding epoch value in seconds, which I'm trying to convert into a Date.

val seconds = 1341855763000
val date = Date(TimeUnit.SECONDS.toMillis(seconds))

The output is way off than I expected. Where did I go wrong?

Actual: Wed Sep 19 05:26:40 GMT+05:30 44491
Expected: Monday July 9 11:12:43 GMT+05:30 2012

Answer 1

The output is way off than I expected. Where did I go wrong?

Actual: Wed Sep 19 05:26:40 GMT+05:30 44491
Expected: Monday July 9 11:12:43 GMT+05:30 2012

The value is already in milliseconds and by using TimeUnit.SECONDS.toMillis(seconds) you are wrongly multiplying it by 1000.

By using the modern date-time API:

import java.time.Instant;

public class Main {
    public static void main(String[] args) {
        Instant instant = Instant.ofEpochMilli(1341855763000L);
        System.out.println(instant);
    }
}

Output:

2012-07-09T17:42:43Z

By using legacy java.util.Date:

import java.util.Date;

public class Main {
    public static void main(String[] args) {
        System.out.println(new Date(1341855763000L));
    }
}

Output:

Mon Jul 09 18:42:43 BST 2012

I recommend you switch from the outdated and error-prone java.util date-time API and SimpleDateFormat to the modern java.time date-time API and the corresponding formatting API (package, java.time.format). Learn more about the modern date-time API from Trail: Date Time.

Answer 2

The value you have is not in seconds but in milliseconds. Remove the "seconds to millis" conversion.

val milliSeconds = 1341855763000
val date = Date(milliSeconds)