Converting string representation of time to unix epoch time.

#include <iostream>
#include <string>
#include <time.h>
#include <stdlib.h>

using namespace std;

int main(int argc, char** argv)
{
    string s_time = "Thu, 19 Oct 2006 11:52:22 +0200";

    struct tm tm;

    /*Convert from string representation to struct tm */

    char* ptr = strptime(s_time.c_str(), "%a, %d %b %Y %T %z", &tm);

    if('\0' != *ptr)
    {
        /*A part of the string was not  processed*/
        cout << "Following part of string not processed:" << ptr  << endl;
    }

    /*Convert from struct tm to time_t structure.*/

    time_t time = mktime(&tm);

    if(-1 == time)
    {
        cout << "Failed to convert from 'struct tm' to 'time_t'" << endl;
        exit(1);
    }
    else
    {
        cout << "Given time in unix time stamp:" << time << endl;
    }

    exit(0);
}

Output:

Given time in unix time stamp:1161238942