std::difftime

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Defined in header `<ctime>`

double difftime( time_t time2, time_t time1 );

Computes difference between two calendar times as time_t objects (time2 - time1) in seconds.

#include <iostream>
#include <ctime>
int main()
{
    std::time_t start = std::time(NULL);
    volatile double d;
    for(int n=0; n<10000; ++n)
       for(int m=0; m<100000; ++m)
           d += d*n*m; // some time-consuming operation
    std::cout << "Wall time passed: " << std::difftime(std::time(NULL), start) << " s.\n";
}

Output:

Wall time passed: 7 s.

[edit] See also


duration (C++11)	a time interval (class template)

std::difftime

From Cppreference

Contents

[edit] Parameters

[edit] Return value

[edit] Example

[edit] See also