std::chrono::system_clock::from_time_t
From cppreference.com
static std::chrono::system_clock::time_point from_time_t( std::time_t t ) noexcept;
|
(since C++11) | |
Converts t to a time point type, using the coarser precision of the two types.
If time_point has lower precision, it is implementation defined whether the value is rounded or truncated.
Parameters
| t | - | std::time_t value to convert |
Return value
A value of type std::chrono::system_clock::time_point representing t.
Example
Run this code
#include <chrono>
#include <ctime>
#include <iostream>
#include <thread>
int main()
{
using namespace std::chrono_literals;
const std::time_t t = std::time(nullptr); // usually has "1 second" precision
const auto from = std::chrono::system_clock::from_time_t(t);
std::this_thread::sleep_for(500ms);
const auto diff = std::chrono::system_clock::now() - from;
std::cout << diff << " ("
<< std::chrono::round<std::chrono::milliseconds>(diff)
<< ")\n";
}
Possible output:
987654321ns (987ms)
See also
[static] |
converts a system clock time point to std::time_t (public static member function) |