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std::chrono::zoned_time(3) C++ Standard Libary std::chrono::zoned_time(3) NAME std::chrono::zoned_time - std::chrono::zoned_time Synopsis Defined in header <chrono> template< class Duration, (since C++20) class TimeZonePtr = const std::chrono::time_zone* > class zoned_time; using zoned_seconds = std::chrono::zoned_time<std::chrono::seconds>; (since C++20) The class zoned_time represents a logical pairing of a time zone and a std::chrono::time_point whose resolution is Duration. An invariant of zoned_time is that it always refers to a valid time zone and represents an existing and unambiguous time point in that time zone. Consistent with this invariant, zoned_time has no move constructor or move assign- ment operator; attempts to move a zoned_time will perform a copy. The program is ill-formed if Duration is not a specialization of std::chrono::duration. The template parameter TimeZonePtr allows users to supply their own time zone pointer types and further customize the behavior of zoned_time via std::chrono::zoned_traits. Custom time zone types need not support all the operations supported by std::chrono::time_zone, only those used by the functions actually called on the zoned_time. TimeZonePtr must be MoveConstructible. Move-only TimeZonePtrs are allowed but difficult to use, as the zoned_time will be immovable and it is not possible to access the stored TimeZonePtr. Member types Member type Definition duration std::common_type_t<Duration, std::chrono::seconds> Member functions constructor constructs a zoned_time (public member function) operator= assigns value to a zoned_time (public member function) get_time_zone obtains a copy of the time zone pointer (public member function) operator local_time obtains the stored time point as a local_time get_local_time (public member function) operator sys_time obtains the stored time point as a sys_time get_sys_time (public member function) get_info obtain information about the time zone at the stored time point (public member function) Non-member functions operator== compares two zoned_time values (C++20) (function template) operator<< outputs a zoned_time into a stream (C++20) (function template) Helper classes std::formatter<std::chrono::zoned_time> formatting support for zoned_time (C++20) (class template specializa- tion) std::hash<std::chrono::zoned_time> hash support for std::chrono::zoned_time (C++26) (class template specializa- tion) Deduction guides Example // Run this code #include <algorithm> #include <chrono> #include <iomanip> #include <iostream> #include <stdexcept> #include <string_view> int main() { constexpr std::string_view locations[] = { "Africa/Casablanca", "America/Argentina/Buenos_Aires", "America/Barbados", "America/Indiana/Petersburg", "America/Tarasco_Bar", "Antarctica/Casey", "Antarctica/Vostok", "Asia/Magadan", "Asia/Manila", "Asia/Shanghai", "Asia/Tokyo", "Atlantic/Bermuda", "Australia/Darwin", "Europe/Isle_of_Man", "Europe/Laputa", "Indian/Christmas", "Indian/Cocos", "Pacific/Galapagos", }; constexpr auto width = std::ranges::max_element(locations, {}, [](const auto& s){ return s.length(); })->length(); for (const auto location : locations) try { // may throw if 'location' is not in the time zone data- base const std::chrono::zoned_time zt{location, std::chrono::system_clock::now()}; std::cout << std::setw(width) << location << " - Zoned Time: " << zt << '\n'; } catch (std::runtime_error& ex) { std::cout << "Error: " << ex.what() << '\n'; } } Possible output: Africa/Casablanca - Zoned Time: 2023-06-29 20:58:34.697449319 +01 America/Argentina/Buenos_Aires - Zoned Time: 2023-06-29 16:58:34.709957354 -03 America/Barbados - Zoned Time: 2023-06-29 15:58:34.709977888 AST America/Indiana/Petersburg - Zoned Time: 2023-06-29 15:58:34.709998072 EDT Error: tzdb: cannot locate zone: America/Tarasco_Bar Antarctica/Casey - Zoned Time: 2023-06-30 06:58:34.710093685 +11 Antarctica/Vostok - Zoned Time: 2023-06-30 01:58:34.710107932 +06 Asia/Magadan - Zoned Time: 2023-06-30 06:58:34.710121831 +11 Asia/Manila - Zoned Time: 2023-06-30 03:58:34.710134751 PST Asia/Shanghai - Zoned Time: 2023-06-30 03:58:34.710153259 CST Asia/Tokyo - Zoned Time: 2023-06-30 04:58:34.710172815 JST Atlantic/Bermuda - Zoned Time: 2023-06-29 16:58:34.710191043 ADT Australia/Darwin - Zoned Time: 2023-06-30 05:28:34.710236720 ACST Europe/Isle_of_Man - Zoned Time: 2023-06-29 20:58:34.710256834 BST Error: tzdb: cannot locate zone: Europe/Laputa Indian/Christmas - Zoned Time: 2023-06-30 02:58:34.710360409 +07 Indian/Cocos - Zoned Time: 2023-06-30 02:28:34.710377520 +0630 Pacific/Galapagos - Zoned Time: 2023-06-29 13:58:34.710389952 -06 See also time_zone represents a time zone (C++20) (class) http://cppreference.com 2024.06.10 std::chrono::zoned_time(3)
NAME | Synopsis | Member types | Member functions | Non-member functions | Helper classes | Example | Possible output: | See also
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