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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 >> ;
(C++20 起)

将 sys_time tp 转换为该 时区 中对应的 local_time 。

目录

参数

tp - 待转换的时间点

返回值

与 tp 及此时区关联的 local_time 。

注释

结果的精度至少为 std::chrono::seconds ，若参数具有更精细的精度，则结果精度将更高。

示例

运行此代码 
#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';
    }
}

可能的输出： 

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