mktime() function in C++ STL
The mktime() is an inbuilt C++ function which converts the local calendar time to the time since epoch and returns the value as an object of type time_t.
Syntax :
time_t mktime( struct tm *time_ptr )
Parameters: The function accepts a mandatory parameter pointer time_ptr that points to a tm object structure which contains a calendar time whihc is to be converted.
Return Value: The function returns two type of values as described below:
- It returns the time since epoch as an object of type time_t if the parameter passed is a success.
- It returns -1 on failure.
Below program illustrates the mktime() function:
// CPP program to demonstrate the// mktime() function #include <bits/stdc++.h>using namespace std; int main(){ time_t tim; tm* time_ptr; char weekday[7][20] = { "Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday" }; // Date int year = 2018; int month = 6; int day = 18; time(&tim); time_ptr = localtime(&tim); // tm_year is time since 1900 time_ptr->tm_year = year - 1900; // Months calculated since January time_ptr->tm_mon = month - 1; // Day calculated in the month time_ptr->tm_mday = day; // time_ptr pointer to be pass mktime(time_ptr); cout << "Tha Day on 18th June 2018 was " << weekday[time_ptr->tm_wday]; return 0;} |
Output:
Tha Day on 18th June 2018 was Monday
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