Getting Future Time

Hello,

I'm having some trouble getting a time in the future. I have no idea why java is giving me this output for the code I put in.

My Code:

Code:java

        long start = System.nanoTime();
        long end = start+30*1000000000;   
        long elapsedTime = end - start;
        double seconds = (double)elapsedTime / 1000000000.0;
        System.out.println("Time Elapsed: " + elapsedTime);
        System.out.println("In Second: " + seconds);

Output:

Code:

Time Elapsed: -64771072
In Second: -0.064771072

Why is it giving me a negative number if end is supposed to be larger than start?

 

Read Oracle's documentation about nanoTime(). I think you might find it most interesting

 

Ah I see. So nanoTime should only be used to measure time elapsed, while currentTimeMillis should be used for specific times. Thanks!

Ok, so I have the exact same lines of code producing different outputs...
Here my code:

Code:java

        long currentTime = System.currentTimeMillis();
        long nextTime = currentTime+TimeUnit.SECONDS.toMillis(30);
        System.out.println("Current time: " + currentTime);
        System.out.println("Next Time: " + nextTime);
        System.out.println("Diff: " + (nextTime-currentTime));
        System.out.println("Next runn will be in " + TimeUnit.MILLISECONDS.toSeconds(nextTime-currentTime));

Here is the output when I run this as a plugin (I'm using spigot):

Code:

[12:52:23 INFO]: Current time: 1332909182835801
[12:52:23 INFO]: Next Time: 1332909118056176
[12:52:23 INFO]: Diff: -65146979
[12:52:23 INFO]: Next runn will be in 0

Here is the output when I run this as a console application

Code:

Current time: 1390243954497
Next Time: 1390243984497
Diff: 30000
Next runn will be in 30

Another thing to note, the "Diff" value when i run it in a plugin produces a different number each time. Any ideas why there is this inconsistency? :/

EDIT by Moderator: merged posts, please use the edit button instead of double posting.