Retrieve Computer time in microsecond

to retrieve computer time i use the function System.currentTimeMillis() but i need the time in microsecond. how could i get that?

<snip>
Java 1.5 added nanosecond methods for hardware/OS
combinations that can support it.Which at current includes none at all :)<snip>
Are you saying that System.nanoTime() isn't supported at the present time?
That's not correct - I am running a 3 GB Pentium 4, a relatively recent GigaByte m/b and XP Pro, and get very good microsecond and submicrosecond results from the method.
I executed 2 consecutuive calls to the method, like so
startTime = System.nanoTime();
estimatedTime = System.nanoTime() - startTime;and averaged 100 repetitions.
Results vary with the manner in which the jvm is executed. Here's a summary of results, to give a feel for what's possible.
Program Execution From        Nanoseconds (average)
Commandline                     1300
CrimsonEditor                    500
jEdit                            700
NetBeans IDE 4.1                1050So, depending on the method of execution, nanosecond precision ranges from 500 to 1300 (0.5 microsecond to 1.3 microsecond). Accuracy (repeatability) is not as good - there are outliers in the individual times, probably due to Garbage Collections. However excluding those outliers, times appear reasonably repeatable.

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With the class java.lang.System you can have time in milli seconds via the function getTimeMillis().
I should be very helpfull to have another function like this getTimeMicros() that returns time in microseconds.
Because in some tests I made I did not have enough precision with time in milliseconds. So I hope for the JDK 1.5.1 this function will be created.
Thanks a lot.

I was requesting precision in microseconds but I was
not expecting to have it in nanos ! It's wonderlfull
It could not be more precise anymore !Well, this makes sense only if the underlying OS
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you actually test it on the platform you're going to
run it on.Moreover it might not be 1 nano either. Just as millis are not necessarily 1 milli.

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Event and computer time zones do not match. In calendar views,the event time is adjusted to display correctly.
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Computing time

hi all,
How to compute time for running program. what I mean is how long the program running.

Unix systems (including Linux) provide the command "time" which does this measurement for the command given as its params.
$ time ls -lt
real    0m0.873s
user    0m0.010s
sys     0m0.030s

Retrieve Computer time in microsecond

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