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std::chrono..._since_epoch(3) C++ Standard Libarystd::chrono..._since_epoch(3) NAME std::chrono::time_point::time_since_epoch - std::chrono::time_point::time_since_epoch Synopsis duration time_since_epoch() const; (since C++11) (until C++14) constexpr duration time_since_epoch() const; (since C++14) Returns a duration representing the amount of time between *this and the clock's epoch. Parameters (none) Return value The amount of time between this time_point and the clock's epoch Example // Run this code #include <iostream> #include <chrono> #include <ctime> int main() { const auto p0 = std::chrono::time_point<std::chrono::sys- tem_clock>{}; const auto p1 = std::chrono::system_clock::now(); const auto p2 = p1 - std::chrono::hours(24); std::time_t epoch_time = std::chrono::system_clock::to_time_t(p0); std::cout << "epoch: " << std::ctime(&epoch_time); std::time_t today_time = std::chrono::system_clock::to_time_t(p1); std::cout << "today: " << std::ctime(&today_time); std::cout << "hours since epoch: " << std::chrono::duration_cast<std::chrono::hours>( p1.time_since_epoch()).count() << '\n'; std::cout << "yesterday, hours since epoch: " << std::chrono::duration_cast<std::chrono::hours>( p2.time_since_epoch()).count() << '\n'; } Possible output: epoch: Thu Jan 1 00:00:00 1970 today: Fri Jun 30 10:44:11 2017 hours since epoch: 416338 yesterday, hours since epoch: 416314 http://cppreference.com 2022.07.31 std::chrono..._since_epoch(3)
NAME | Synopsis | Parameters | Return value | Example | Possible output:
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