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std::chrono::time_point<Clock,Duration>:: max

From cppreference.net
C++
Date and time library
std::chrono::time_point
static constexpr time_point max ( ) ;
(C++20まで)
static constexpr time_point max ( ) noexcept ;
(C++20から)

最大の期間を持つ time_point を返します。つまり time_point ( duration :: max ( ) ) です。

パラメータ

(なし)

戻り値

可能な最大の time_point 。

例

このコードを実行 
#include <chrono>
#include <iostream>
#include <vector>
int main() 
{
    std::chrono::time_point<std::chrono::system_clock> now =
        std::chrono::system_clock::now();
    std::vector<std::chrono::time_point<std::chrono::system_clock>> times
    {
        now - std::chrono::hours(24),
        now - std::chrono::hours(48),
        now + std::chrono::hours(24)
    };  
    std::chrono::time_point<std::chrono::system_clock> earliest =
        std::chrono::time_point<std::chrono::system_clock>::max();
    std::cout << "all times:\n";
    for (const auto& time : times)
    {
        std::time_t t = std::chrono::system_clock::to_time_t(time);
        std::cout << std::ctime(&t);
        if (time < earliest)
            earliest = time;
    }
    std::time_t t = std::chrono::system_clock::to_time_t(earliest);
    std::cout << "earliest:\n" << std::ctime(&t);
}

出力例: 

all times:
Sun Oct  7 19:06:48 2012
Sat Oct  6 19:06:48 2012
Tue Oct  9 19:06:48 2012
earliest:
Sat Oct  6 19:06:48 2012