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Showing content from https://en.cppreference.com/w/cpp/language/../algorithm/../preprocessor/../chrono/current_zone.html below:

std::chrono::current_zone - cppreference.com

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C-style date and time [edit]

Defined in header

<chrono> const std::chrono::time_zone* current_zone(); (since C++20)

Convenience function for obtaining local time zone from the time zone database. Equivalent to std::chrono::get_tzdb().current_zone().

Contents

[edit] Exceptions

std::runtime_error if this is the first reference to the time zone database and the time zone database cannot be initialized.

[edit] Notes

A call to this function that is the first reference to the time zone database will cause it to be initialized.

[edit] Example

Run this code

#include <chrono>
#include <iostream>
 
int main()
{
    try
    {
        const std::chrono::zoned_time cur_time
        {
            std::chrono::current_zone(), // may throw
            std::chrono::system_clock::now()
        };
        std::cout << cur_time << '\n';
    }
    catch(const std::runtime_error& ex)
    {
        std::cerr << ex.what() << '\n';        
    }
}

Possible output:

2021-09-13 19:46:42.249182012 MAGT
[edit] See also current_zone return the local time zone
(public member function of std::chrono::tzdb) [edit] get_tzdbget_tzdb_listreload_tzdbremote_version

(C++20)

accesses and controls the global time zone database information
(function) [edit]

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