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

I have the following code:

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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
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