std::chrono::time_point::time_since_epoch
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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