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

std::tm - cppreference.com

Structure holding a calendar date and time broken down into its components.

[edit] Member objects seconds after the minute – [â0â, 61](until C++11) [â0â, 60](since C++11)^{[note 1]}
(public member object) minutes after the hour – [â0â, 59]
(public member object) hours since midnight – [â0â, 23]
(public member object) day of the month – [1, 31]
(public member object) months since January – [â0â, 11]
(public member object) years since 1900
(public member object) days since Sunday – [â0â, 6]
(public member object) days since January 1 – [â0â, 365]
(public member object) Daylight Saving Time flag. The value is positive if DST is in effect, zero if not and negative if no information is available.
(public member object)

â Range allows for a positive leap second. Two leap seconds in the same minute are not allowed (the range [â0â, 61] was a defect introduced in C89 and corrected in C99).

[edit] Notes

BSD, GNU and musl C library support two additional members, which are standardized in POSIX.1-2024.

seconds east of UTC
(public member object) timezone abbreviation
(public member object) [edit] Example

#include <ctime>
#include <iostream>
 
int main()
{
    std::tm tm{};
    tm.tm_year = 2022 - 1900;
    tm.tm_mday = 1;
    std::mktime(&tm);
 
    std::cout << std::asctime(&tm); // note implicit trailing '\n'
}

Possible output:

[edit] See also converts time since epoch to calendar time expressed as local time
(function) [edit] converts time since epoch to calendar time expressed as Universal Coordinated Time
(function) [edit]

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