std::chrono::clock_cast

(C++11)

(C++20)

(C++11)

system_clock (C++11)
steady_clock (C++11)
high_resolution_clock (C++11)

is_clock (C++20)
utc_clock (C++20)
tai_clock (C++20)

gps_clock (C++20)
file_clock (C++20)
local_t (C++20)

is_amis_pm

(C++20)(C++20)

make12make24

(C++20)(C++20)

hh_mm_ss (C++20)

day (C++20)
month (C++20)
year (C++20)
weekday (C++20)
operator/ (C++20)
year_month_day (C++20)

year_month_day_last (C++20)
year_month_weekday (C++20)
year_month_weekday_last (C++20)
weekday_indexed (C++20)
weekday_last (C++20)
month_day (C++20)

month_day_last (C++20)
month_weekday (C++20)
month_weekday_last (C++20)
year_month (C++20)
last_speclast (C++20)(C++20)

tzdb (C++20)
tzdb_list (C++20)
get_tzdbget_tzdb_listreload_tzdbremote_version (C++20)(C++20)(C++20)(C++20)
sys_info (C++20)

local_info (C++20)
nonexistent_local_time (C++20)
ambiguous_local_time (C++20)
locate_zone (C++20)
current_zone (C++20)
time_zone (C++20)
choose (C++20)

zoned_traits (C++20)
zoned_time (C++20)
time_zone_link (C++20)
leap_second (C++20)
leap_second_info (C++20)
get_leap_second_info (C++20)

/ chrono

parse

(C++20)

C

[edit]

`<chrono>`
`template <class Dest, class Source, class Duration> auto clock_cast(const std::chrono::time_point<Source, Duration>& t);`		( C++20)

t Source Dest, std::chrono::system_clock / std::chrono::utc_clock , .

std::chrono::clock_time_conversion<Dest, Source>{}(t) , .
, ,

, .
; .

1)

std::chrono::clock_time_conversion<Dest, std::chrono::system_clock>{}(     std::chrono::clock_time_conversion<std::chrono::system_clock, Source>{}(t))

2)

std::chrono::clock_time_conversion<Dest, std::chrono::utc_clock>{}(     std::chrono::clock_time_conversion<std::chrono::utc_clock, Source>{}(t))

, ,

, , .
; .

1)

std::chrono::clock_time_conversion<Dest, std::chrono::utc_clock>{}(     std::chrono::clock_time_conversion<std::chrono::utc_clock, std::chrono::system_clock>{}(         std::chrono::clock_time_conversion<std::chrono::system_clock, Source>{}(t)))

2)

std::chrono::clock_time_conversion<Dest, std::chrono::system_clock>{}(     std::chrono::clock_time_conversion<std::chrono::system_clock, std::chrono::utc_clock>{}(         std::chrono::clock_time_conversion<std::chrono::utc_clock, Source>{}(t)))

.

, , .

clock_time_conversion

(C++20)

, ,
( ) []

cppreference.com

std::chrono::clock_cast