How to convert Duration to seconds?

Question

    LocalDateTime start = LocalDateTime.of(2018, 9, 2, 14, 17, 25, 135);
    LocalDateTime end = LocalDateTime.of(2018, 9, 2, 14, 19, 59, 965);
    Duration duration = Duration.between(start, end);

I need to get result in this format : 2:34.830.

Minutes and nanoseconds - no problem :

    System.out.println(duration.toMinutes());
    System.out.println(duration.toNanos());

but how can I gain seconds - 34 seconds from this example?

You can try this: https://stackoverflow.com/questions/17940200/how-to-find-the-duration-of-difference-between-two-dates-in-java — Malay Shah, Jan 16 '20 at 11:19
Did you read [the Javadoc](https://docs.oracle.com/javase/8/docs/api/java/time/Duration.html)? — chrylis -cautiouslyoptimistic-, Jan 16 '20 at 11:19
Does this answer your question? [How to format a duration in java? (e.g format H:MM:SS)](https://stackoverflow.com/questions/266825/how-to-format-a-duration-in-java-e-g-format-hmmss) — M. Prokhorov, Jan 16 '20 at 11:22
In actual fact, `duration.toMinutes()` and `duration.toNanos()` also doesn't do what OP expects. See the linked javadoc for more details, and read it carefully. — M. Prokhorov, Jan 16 '20 at 11:25
I strongly suspect that `toMinutesPart()`, `toSecondsPart()` and `toNanosPart()` are the desired methods here. — Jon Skeet, Jan 16 '20 at 11:26

score 5 · Accepted Answer · answered Jan 16 '20 at 11:36

What you are looking for is the following:

System.out.println(duration.getSeconds()%60);

Alternatively,

System.out.println(duration.getSeconds() - duration.toMinutes()*60);

From Java 9, there is a dedicated method for this toSecondsPart():

System.out.println(duration.toSecondsPart());

Shafiul · Answer 2 · 2020-01-16T11:47:06.073

0

With some math, you can get it like expected.

        long minutes = duration.toMinutes();
        long seconds = duration.getSeconds() % 60;
        long nanoSeconds = duration.toNanos() % 1000_000_000L;
        System.out.println(String.format("%d:%d.%d", minutes, seconds, nanoSeconds));

Output:

2:34.830

Edit: After @M. Prokhorov's comment, extending it for hours also, similarly:

    long hours = duration.toHours();
    long minutes = duration.toMinutes() % 60;

And format it like:

System.out.println(String.format("%d:%d:%d.%d", hours, minutes, seconds, nanoSeconds));

Output:

0:2:34.830

edited Jan 16 '20 at 11:47

answered Jan 16 '20 at 11:37

Shafiul

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That **if** OP is OK with duration of several hundred minutes in this printout. – M. Prokhorov Jan 16 '20 at 11:40
true, assuming from the example that his interest is in minute precision. – Shafiul Jan 16 '20 at 11:43

How to convert Duration to seconds?

2 Answers2