#include <time.h>
#include <stdio.h>
#include <sys/time.h>

#include <iostream>
#include <limits.h>
#include <cstdlib>

using namespace std;

#ifndef tv_usec
typedef int32_t tv_usec;
#endif

int main() {
    time_t now, res;

    timeval timeValue;
    struct timezone timeZone;
    tv_usec us1;

    cout << "A time_t is " << sizeof(time_t) << " bytes" << endl;

    res = time(&now);
    cout << "The time now is " << now << endl;
    cout << "It is also " << res << endl;

    cout << "That is " << asctime(localtime(&now)) << endl;

    cout << endl;
    res = 0;
    cout << "Time " << res << "  was " << asctime(localtime(&res)) << endl;

    cout << endl;
    res = 1;
    cout << "Time " << res << "  was " << asctime(localtime(&res)) << endl;

    cout << endl;
    res = INT_MAX;
    cout << "Time " << res << "  was " << asctime(localtime(&res)) << endl;

    cout << endl;
    res = INT_MIN;
    cout << "Time " << res << "  was " << asctime(localtime(&res)) << endl;

    cout << endl;
    gettimeofday(&timeValue, &timeZone);
    us1= timeValue.tv_usec;
    cout << "The results of gettimeofday are " << endl;
    cout << "\tSeconds:        " << timeValue.tv_sec << endl;
    cout << "\tmicroseconds:   " <<  timeValue.tv_usec << endl;
    cout << "\tMinutes west:   " << timeZone.tz_minuteswest << endl;
    cout << "\t\tThat is " << timeZone.tz_minuteswest/60 << " hours " << endl;
    cout << "\tDST correction: " << timeZone.tz_dsttime << endl;
    cout << endl;

    gettimeofday(&timeValue, &timeZone);
    cout << "\tSeconds:        " << timeValue.tv_sec << endl;
    cout << "\tmicroseconds:   " <<  timeValue.tv_usec << endl;
    cout << "\t\tA change  of " << timeValue.tv_usec-us1 << " usec " << endl;
    cout << endl;
    us1= timeValue.tv_usec;

    gettimeofday(&timeValue, &timeZone);
    cout << "\tSeconds:        " << timeValue.tv_sec << endl;
    cout << "\tmicroseconds:   " <<  timeValue.tv_usec << endl;
    cout << "\t\tA change  of " << timeValue.tv_usec-us1 << " usec " << endl;

    return 0;
}