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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 specialization of std::for- matter that std::formatter<std::chrono::zoned_time> formats a zoned_time accord- ing to the (C++20) provided format (class template specializa- tion) Deduction guides Example // Run this code #include <chrono> #include <iomanip> #include <iostream> #include <algorithm> #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::chrono::nonexistent_local_time& ex) { std::cout << "Error: " << ex.what() << '\n'; } } } Possible output: Africa/Casablanca - Zoned Time: 2021-09-16 10:26:54.837665555 +01 America/Argentina/Buenos_Aires - Zoned Time: 2021-09-16 06:26:55.090150136 -03 America/Barbados - Zoned Time: 2021-09-16 05:26:55.090419331 AST America/Indiana/Petersburg - Zoned Time: 2021-09-16 05:26:55.090465623 EDT Error: America/Tarasco_Bar not found in timezone database Antarctica/Casey - Zoned Time: 2021-09-16 20:26:55.123070973 +11 Antarctica/Vostok - Zoned Time: 2021-09-16 15:26:55.123151218 +06 Asia/Magadan - Zoned Time: 2021-09-16 20:26:55.123208852 +11 Asia/Manila - Zoned Time: 2021-09-16 17:26:55.123434512 PST Asia/Shanghai - Zoned Time: 2021-09-16 17:26:55.123520538 CST Asia/Tokyo - Zoned Time: 2021-09-16 18:26:55.123626199 JST Atlantic/Bermuda - Zoned Time: 2021-09-16 06:26:55.123713854 ADT Australia/Darwin - Zoned Time: 2021-09-16 18:56:55.155857464 ACST Europe/Isle_of_Man - Zoned Time: 2021-09-16 10:26:55.155909304 BST Error: Europe/Laputa not found in timezone database Indian/Christmas - Zoned Time: 2021-09-16 16:26:55.215065303 +07 Indian/Cocos - Zoned Time: 2021-09-16 15:56:55.215137548 +0630 Pacific/Galapagos - Zoned Time: 2021-09-16 03:26:55.215201447 -06 http://cppreference.com 2022.07.31 std::chrono::zoned_time(3)
NAME | Synopsis | Member types | Member functions | Non-member functions | Helper classes | Example | Possible output:
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