Problem with <chrono>

This is a discussion on Problem with <chrono> within the C++ Programming forums, part of the General Programming Boards category; Probably somebody can help me with a new library <chrono> By some way when I'm trying get system time with ...

  1. #1
    Registered User kaspari22's Avatar
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    Problem with <chrono>

    Probably somebody can help me with a new library <chrono>

    By some way when I'm trying get system time with nanoseconds for example I have this result:

    9h 7m 55s 0ms 0us 0ns

    In header:

    #include <chrono>
    #include <iostream>
    #include <ctime>

    I don't have any idea if something else is required...

    Software used: Codeblocks
    Compilator: GNU GCC
    C++0x enabled

  2. #2
    C++ Witch laserlight's Avatar
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    What's the problem that you're facing?
    C + C++ Compiler: MinGW port of GCC
    Version Control System: Bazaar

    Look up a C++ Reference and learn How To Ask Questions The Smart Way

  3. #3
    Registered User kaspari22's Avatar
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    I'm expecting some numbers instead of zero in "0ms 0us 0ns". Seems like time is counted only till seconds.

  4. #4
    C++ Witch laserlight's Avatar
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    I suggest that you post the smallest and simplest compilable program that demonstrates the problem.
    C + C++ Compiler: MinGW port of GCC
    Version Control System: Bazaar

    Look up a C++ Reference and learn How To Ask Questions The Smart Way

  5. #5
    Registered User kaspari22's Avatar
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    Whole script:

    Code:
    #include <chrono>
    #include <iostream>
    #include <ctime>
    
    
    std::chrono::system_clock::duration duration_since_midnight() {
        auto now = std::chrono::system_clock::now();
    
        time_t tnow = std::chrono::system_clock::to_time_t(now);
        tm *date = std::localtime(&tnow);
        date->tm_hour = 0;
        date->tm_min = 0;
        date->tm_sec = 0;
        auto midnight = std::chrono::system_clock::from_time_t(std::mktime(date));
    
        return now-midnight;
    }
    
    int main()
    {
        auto since_midnight = duration_since_midnight();
    
        auto hours = std::chrono::duration_cast<std::chrono::hours>(since_midnight);
        auto minutes = std::chrono::duration_cast<std::chrono::minutes>(since_midnight - hours);
        auto seconds = std::chrono::duration_cast<std::chrono::seconds>(since_midnight - hours - minutes);
        auto milliseconds = std::chrono::duration_cast<std::chrono::milliseconds>(since_midnight - hours - minutes - seconds);
        auto microseconds = std::chrono::duration_cast<std::chrono::microseconds>(since_midnight - hours - minutes - seconds - milliseconds);
        auto nanoseconds = std::chrono::duration_cast<std::chrono::nanoseconds>(since_midnight - hours - minutes - seconds - milliseconds - microseconds);
    
        std::cout << hours.count() << "h ";
        std::cout << minutes.count() << "m ";
        std::cout << seconds.count() << "s ";
        std::cout << milliseconds.count() << "ms ";
        std::cout << microseconds.count() << "us ";
        std::cout << nanoseconds.count() << "ns\n";
    
    }

  6. #6
    C++ Witch laserlight's Avatar
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    Well, I am getting output like:
    Code:
    15h 58m 43s 282ms 425us 0ns
    so this could just be platform dependent.
    C + C++ Compiler: MinGW port of GCC
    Version Control System: Bazaar

    Look up a C++ Reference and learn How To Ask Questions The Smart Way

  7. #7
    Registered User kaspari22's Avatar
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    Seems like I was thinking about this also...
    I test it on Windows XP and also on Windows 7...

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