C++ boost::chrono vs std:chrono time since epoch (get current system time) in windows

Question

I tried to use boost/chrono.... using boost::chrono::high_resolution_clock::now().time_since_epoch()
I am not able to get the current system time instead I get Thu Jan 01 09:53:53 1970... but with std::chrono I am able to get the correct system time.

How to get current system time using boost/chrono same as std:: chrono?

Answer 1

To get the system time, use system_clock not high_resolution_clock .

There's no guarantee, in either Boost or the standard library, that high_resolution_clock will use the same epoch as the system clock.

Answer 2

Use simple math

boost::posix_time::ptime const time_epoch(boost::gregorian::date(1970, 1, 1));

auto ms = (boost::posix_time::microsec_clock::local_time() - time_epoch).total_microseconds();
std::cout << "microseconds: " << ms << "\n";

boost::posix_time::ptime now = time_epoch + boost::posix_time::microseconds(ms);
std::cout << boost::posix_time::to_iso_string(now);

More samples:

• time since epoch to string using boost
• Actual millis in a C++
• Creating a boost::posix_time::ptime object from a 64 bit integer second count (custom epoch)