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std::chrono::time_zone:: to_local

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C++
Date and time library
std::chrono::time_zone
Member functions
time_zone::to_local
Nonmember functions
template < class Duration >

auto to_local ( const std:: chrono :: sys_time < Duration > & tp ) const

- > std:: chrono :: local_time < std:: common_type_t < Duration, std:: chrono :: seconds >> ;
(since C++20)

Converts the sys_time tp to the corresponding local_time in this time zone .

Contents

Parameters

tp - a time point to be converted

Return value

The local_time associated with tp and this time zone.

Notes

The precision of the result is at least std::chrono::seconds , and will be finer if the argument has finer precision.

Example

Run this code 
#include <chrono>
#include <iostream>
int main()
{
    const auto some_zone_name{"Australia/Sydney"};
    const auto time_pt_utc{std::chrono::system_clock::now()};
    std::cout << "Current time UTC is:\t\t " << time_pt_utc << '\n';
    try
    {
        std::cout << "Current time local is:\t\t "
                  << std::chrono::current_zone()-> // may throw
                      to_local(time_pt_utc) << '\n'
                  << "Current time " << some_zone_name << " is:\t "
                  << std::chrono::locate_zone(some_zone_name)-> // may throw
                      to_local(time_pt_utc) << '\n';
    }
    catch(const std::runtime_error& ex)
    {
        std::cout << ex.what() << '\n';
    }
}

Possible output: 

Current time UTC is:              2025-02-10 13:38:13.233872158
Current time local is:            2025-02-10 16:38:13.233872158
Current time Australia/Sydney is: 2025-02-11 00:38:13.233872158