Declaration

tm* gmtime(const time_t* kqpTime);

Description

This function converts a time_t argument into a tm data type. The passed in argument, kqpTime, is a pointer to a time_t variable which specifies number of seconds elapsed since midnight January 1, 1970. The time_t is value is calculated with the time() function. The value returned is a pointer to a tm struct variable that specifies the time with the seconds broken down into seconds, minutes, hours, etc. according to the tm struct definition.

Example

#include <iostream>
#include <ctime>

int main() {
    using namespace std;

    time_t qTime;
    tm* qpTimeSpec;
    // Get the number of seconds since midnight Jan. 1, 1970
    time(&qTime);
    // Convert the seconds to a tm struct variable
    qpTimeSpec = gmtime(&qTime);
    cout << "The year is " << (1900 + qpTimeSpec->tm_year) << endl;
    cout << "The month is " << qpTimeSpec->tm_mon << endl;
    cout << "The day of the month is " << qpTimeSpec->tm_mday << endl;
    cout << "The day of the week is " << qpTimeSpec->tm_wday << endl;
    cout << "Daylight savings time? " << qpTimeSpec->tm_isdst << endl;
    cout << "The hour is " << qpTimeSpec->tm_hour << endl;
    cout << "The minute is " << qpTimeSpec->tm_min << endl;
    cout << "The second is " << qpTimeSpec->tm_sec << endl;
    cout << "The day of the year is " << qpTimeSpec->tm_yday << endl;

    return 0;
}

Output