如何将 std::chrono::time_point 转换为自纪元以来的毫秒
如果你有 std::chrono::time_point 如
timepoint_now.cpp
std::chrono::time_point<std::chrono::system_clock> timepoint = std::chrono::system_clock::now();你可以通过首先使用将其转换为 chrono::duration 来转换为自纪元以来的毫秒
timepoint_time_since_epoch.cpp
timepoint.time_since_epoch(); // Returns a duration
然后使用 std::chrono::duration_cast<std::chrono::milliseconds>(...).count() 将其转换为自纪元以来的 milliseconds 并获取纪元和时间点之间的间隔数（= 秒）。
timepoint_to_ms.cpp
std::chrono::duration_cast<std::chrono::milliseconds>(timepoint.time_since_epoch()).count()完整示例：
timepoint_example.cpp
#include <chrono>
#include <iostream>
int main()
{
auto timepoint = std::chrono::system_clock::now();
std::cout << "Milliseconds since epoch: " <<
std::chrono::duration_cast<std::chrono::milliseconds>(timepoint.time_since_epoch()).count() << std::endl;
}例如，这会打印：
ms_output.txt
Milliseconds since epoch: 1690755347529Check out similar posts by category:
C/C++
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