How to find the difference between time_point<utc_clock> and time_point<system_clock>?

[JUANDENT]

I have the following code:

auto utc_now = chr::utc_clock::now();
auto now = chr::system_clock::now();
auto dif = now - utcNow;  // does not compile 

how to compare between one time_point to another when we use different clocks?

Regards

[deleted account xyzzy]

https://stackoverflow.com/questions/35282308/convert-between-c11-clocks

https://en.cppreference.com/w/cpp/chrono/utc_clock/to_sys