# Deduction guides for `std::chrono::zoned_time`

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< cpp‎ | chrono‎ | zoned time

zoned_time() -> zoned_time<std::chrono::seconds>; | (1) | (since C++20)
template< class Duration > zoned_time(std::chrono::sys_time<Duration>) -> zoned_time<std::common_type_t<Duration, std::chrono::seconds>>; | (2) | (since C++20)
template< class TimeZonePtrOrName > zoned_time(TimeZonePtrOrName) -> zoned_time<std::chrono::seconds, /* see below */>; | (3) | (since C++20)
template< class TimeZonePtrOrName, class Duration > zoned_time(TimeZonePtrOrName, std::chrono::sys_time<Duration>) -> zoned_time<std::common_type_t<Duration, std::chrono::seconds>, /* see below */>; | (4) | (since C++20)
template< class TimeZonePtrOrName, class Duration > zoned_time(TimeZonePtrOrName, std::chrono::local_time<Duration>, std::chrono::choose = std::chrono::choose::earliest) -> zoned_time<std::common_type_t<Duration, std::chrono::seconds>, /* see below */>; | (5) | (since C++20)
template< class TimeZonePtrOrName, class Duration, class TimeZonePtr2 > zoned_time(TimeZonePtrOrName, std::chrono::zoned_time<Duration, TimeZonePtr2>, std::chrono::choose = std::chrono::choose::earliest) -> zoned_time<std::common_type_t<Duration, std::chrono::seconds>, /* see below */>; | (6) | (since C++20)

Six deduction guides are provided for `zoned_time`. They normalize `Duration` to a minimum resolution of std::chrono::seconds, and provide correct handling for time zone names specified using types convertible to std::string_view.

3-6) If std::is_convertible_v<TimeZonePtrOrName, std::string_view> is true, the deduced second template argument is const std::chrono::time_zone*. Otherwise it is `TimeZonePtrOrName`.
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