How to measure the a time-span in seconds using System currentTimeMillis

Question

How to convert System currentTimeMillis    to seconds   long start6 System currentTimeMillis    System out println counter countPrimes 100000000    for   start6     The console shows me 5761455 for 1307816001290  I can t read how many seconds that is   Any help

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Convert millis to seconds  This can be simplified a bit     but I left it in this form for clarity  long m   System currentTimeMillis       that s our input int s   Math max     18    Math toRadians m  Math PI     Math pow  Math E  Math log m -Math log 1000       System out println   quot seconds   quot  s

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From your code it would appear that you are trying to measure how long a computation took  as opposed to trying to figure out what the current time is    In that case  you need to call currentTimeMillis before and after the computation  take the difference  and divide the result by 1000 to convert milliseconds to seconds

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TimeUnit  Use the TimeUnit enum built into Java 5 and later   long timeMillis   System currentTimeMillis    long timeSeconds   TimeUnit MILLISECONDS toSeconds timeMillis

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Java 8 now provides the most concise method to get current Unix Timestamp   Instant now   getEpochSecond

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For conversion of milliseconds to seconds  since 1 second   10   milliseconds     here m will be in seconds long m   System currentTimeMillis   1000     here m will be in minutes long m   System currentTimeMillis   1000 60    this will give in mins

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TimeUnit SECONDS convert start6  TimeUnit MILLISECONDS

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long start   System currentTimeMillis    counter countPrimes 1000000   long end   System currentTimeMillis     System out println  Took         end - start    1000      UPDATE  An even more accurate solution would be   final long start   System nanoTime    counter countPrimes 1000000   final long end   System nanoTime     System out println  Took        end - start    1000000     ms    System out println  Took       end - start   1000000000     seconds

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I have written the following code in my last assignment  it may help you      A method that converts the nano-seconds to Seconds-Minutes-Hours form private static String formatTime long nanoSeconds        int hours  minutes  remainder  totalSecondsNoFraction      double totalSeconds  seconds           Calculating hours  minutes and seconds     totalSeconds    double  nanoSeconds   1000000000 0      String s   Double toString totalSeconds       String    arr   s split             totalSecondsNoFraction   Integer parseInt arr 0        hours   totalSecondsNoFraction   3600      remainder   totalSecondsNoFraction   3600      minutes   remainder   60      seconds   remainder   60      if arr 1  contains  E    seconds   Double parseDouble       arr 1        else seconds    Double parseDouble       arr 1             Formatting the string that conatins hours  minutes and seconds     StringBuilder result   new StringBuilder           String sep       nextSep     and        if seconds  gt  0                result insert 0    seconds   insert 0  seconds           sep   nextSep          nextSep                   if minutes  gt  0                if minutes  gt  1  result insert 0  sep  insert 0    minutes   insert 0  minutes           else result insert 0  sep  insert 0    minute   insert 0  minutes           sep   nextSep          nextSep                   if hours  gt  0                if hours  gt  1  result insert 0  sep  insert 0    hours   insert 0  hours           else result insert 0  sep  insert 0    hour   insert 0  hours             return result toString        Just convert nano-seconds to milli-seconds

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like so    int  milliseconds   1000

[java] How to measure the a time-span in seconds using System.currentTimeMillis()?

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