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Showing content from http://en.cppreference.com/w/cpp/../cpp/../cpp/algorithm/../chrono/zoned_time/zoned_time.html below:

std::chrono::zoned_time<Duration,TimeZonePtr>::zoned_time - cppreference.com

zoned_time();

(1) (since C++20) (2) (since C++20)

zoned_time( const zoned_time& other ) = default;

(3) (since C++20) (4) (since C++20)

explicit zoned_time( TimeZonePtr z );

(5) (since C++20) (6) (since C++20) (7) (since C++20) (8) (since C++20) (9) (since C++20) (10) (since C++20) (11) (since C++20) (12) (since C++20) template< class Duration2, class TimeZonePtr2 > zoned_time( TimeZonePtr z, const std::chrono::zoned_time<Duration2, TimeZonePtr2>& zt ); (13) (since C++20) (14) (since C++20) (15) (since C++20) (16) (since C++20)

Constructs a zoned_time object, initializing the stored time zone pointer and time point according to the following table, where traits is std::chrono::zoned_traits<TimeZonePtr>:

Overload Time zone pointer (denoted zone) Time point (a std::chrono::sys_time<duration>) Notes (1) traits::default_zone() default constructed (a) (2) st (3) other.get_time_zone() other.get_sys_time() (b) (4) other.get_time_zone() other.get_sys_time() (e) (5) std::move(z) default constructed (6) traits::locate_zone(name) (c) (7) std::move(z) st (8) traits::locate_zone(name) (c) (9) std::move(z) zone->to_sys(tp) (d) (10) traits::locate_zone(name) (c,d) (11) std::move(z) zone->to_sys(tp, c) (d) (12) traits::locate_zone(name) (c,d) (13,14) std::move(z) zt.get_sys_time() (e) (15,16) traits::locate_zone(name) (c,e)

a) Constructors specified to call traits::default_zone() (1,2) do not participate in overload resolution if that expression is not well-formed.

c)

Constructors with a

std::string_view

parameter

name (6,8,10,12,15,16)

do not participate in overload resolution if

traits::locate_zone(name)

is not well-formed or if that expression is not convertible to

TimeZonePtr

d)

Constructors specified to call

zone->to_sys (9-12)

do not participate in overload resolution if that call expression is not well-formed or if the result is not convertible to

std::chrono::sys_time<duration>

e) Constructors with a template parameter Duration2 (4,13-16) do not participate in overload resolution if Duration2 is not convertible to Duration.

The behavior is undefined if the time zone pointer (initialized as described above) does not refer to a time zone.

[edit] Notes

zoned_time does not have a move constructor and attempting to move one will perform a copy instead using the defaulted copy constructor (3). Thus, when TimeZonePtr is a move-only type, zoned_time is immovable: it can be neither moved nor copied.

The constructors (14,16) accept a std::chrono::choose parameter, but that parameter has no effect.

[edit] Example

Possible output:

1970-01-01 00:00:00 UTC : default
1969-12-31 17:00:00 MST : America/Phoenix
1970-01-01 00:00:00 UTC : UTC time zone
2021-12-31 00:00:00 CET : Europe/Rome
2021-12-31 01:00:00 CET : Europe/Rome
2021-09-20 23:04:00 CEST : Europe/Rome
2021-09-21 06:04:00 JST : Asia/Tokyo
2021-09-20 17:04:00 EDT : America/New_York

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