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    std::chrono::local_info

    From cppreference.com
     
    C++
     
    Date and time library
    Time point
    (C++11)
    (C++20)  
    (C++20)
    Duration
    (C++11)
    Clocks
    (C++11)
    (C++11)
    (C++20)
    (C++20)
    (C++20)
    (C++11)
    (C++20)
    (C++20)
    (C++20)
    Time of day
    (C++20)(C++20)
    (C++20)(C++20)
    (C++20)
    Calendar
    (C++20)
    (C++20)
    (C++20)
    (C++20)
    (C++20)
    (C++20)
    (C++20)
    (C++20)
    (C++20)  
    (C++20)
    (C++20)
    (C++20)
    (C++20)
    (C++20)
    (C++20)
    (C++20)
    (C++20)(C++20)
    chrono I/O
    (C++20)

    Time zone
    (C++20)
    (C++20)
    (C++20)(C++20)(C++20)(C++20)
    (C++20)
    (C++20)
    (C++20)
    (C++20)
    (C++20)
    (C++20)
    (C++20)
    (C++20)