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Showing content from https://en.cppreference.com/w/cpp/language/../error/error_code/../../../cpp/chrono/c/mktime.html below:

std::mktime - cppreference.com

Converts local calendar time to a time since epoch as a std::time_t object. time->tm_wday and time->tm_yday are ignored. The values in time are permitted to be outside their normal ranges.

A negative value of time->tm_isdst causes mktime to attempt to determine if Daylight Saving Time was in effect.

If the conversion is successful, the time object is modified. All fields of time are updated to fit their proper ranges. time->tm_wday and time->tm_yday are recalculated using information available in other fields.

Time since epoch as a std::time_t object on success or -1 if time cannot be represented as a std::time_t object.

If the std::tm object was obtained from std::get_time or the POSIX strptime, the value of tm_isdst is indeterminate, and needs to be set explicitly before calling mktime.

Construct a local time explicitly.

#include <ctime>
#include <iomanip>
#include <iostream>
#include <sstream>
 
int main()
{
    setenv("TZ", "/usr/share/zoneinfo/America/Los_Angeles", 1); // POSIX-specific
 
    std::tm tm{}; // Zero initialise
    tm.tm_year = 2020 - 1900; // 2020
    tm.tm_mon = 2 - 1; // February
    tm.tm_mday = 15; // 15th
    tm.tm_hour = 10;
    tm.tm_min = 15;
    tm.tm_isdst = 0; // Not daylight saving
    std::time_t t = std::mktime(&tm); 
    std::tm local = *std::localtime(&t);
 
    std::cout << "local: " << std::put_time(&local, "%c %Z") << '\n';
}

Possible output:

local: Sat Feb 15 10:15:00 2020 PST

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