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std::chrono::time_point::time_since_epoch

STD：：时间：：时间[医]要点：：时间[医]自[医]时代

duration time_since_epoch() const;​(since C++11) (until C++14)
constexpr duration time_since_epoch() const;​(since C++14)

返回duration表示之间的时间量*this而clock%27S时代

参数

%280%29

返回值

这段时间time_point而clock%27S时代

例

二次

#include <iostream>
#include <chrono>
#include <ctime>
 
int main()
{
    std::chrono::time_point<std::chrono::system_clock> p1, p2, p3;
 
    p2 = std::chrono::system_clock::now(
    p3 = p2 - std::chrono::hours(24
 
    std::time_t epoch_time = std::chrono::system_clock::to_time_t(p1
    std::cout << "epoch: " << std::ctime(&epoch_time
    std::time_t today_time = std::chrono::system_clock::to_time_t(p2
    std::cout << "today: " << std::ctime(&today_time
 
    std::cout << "hours since epoch: "
              << std::chrono::duration_cast<std::chrono::hours>(
                   p2.time_since_epoch()).count() 
              << '\n';
    std::cout << "yesterday, hours since epoch: "
              << std::chrono::duration_cast<std::chrono::hours>(
                   p3.time_since_epoch()).count() 
              << '\n';
}

二次

可能的产出：

二次

epoch: Wed Dec 31 19:00:00 1969
today: Tue Jun 19 12:05:37 2012
hours since epoch: 372256
yesterday, hours since epoch: 372232

二次

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