How to convert std::chrono::time_point to calendar datetime string with fractional seconds?

Question

How to convert std::chrono::time_point to calendar datetime string with fractional seconds?

For example:

\"10-10-2012 12:38:40.123456\"         


        

Answer 1

I would have put this in a comment on the accepted answer, since that's where it belongs, but I can't. So, just in case anyone gets unreliable results, this could be why.

Be careful of the accepted answer, it fails if the time_point is before the epoch.

This line of code:

std::size_t fractional_seconds = ms.count() % 1000;

will yield unexpected values if ms.count() is negative (since size_t is not meant to hold negative values).