What the value of "chrono::steady_clock::now().time_since_epoch().count()" represents?

cout << chrono::steady_clock::now().time_since_epoch().count() << "\n"; // it prints a 14-digit value

Is is the number of nanoseconds passed since 1970?

>Solution :

Is is the number of nanoseconds passed since 1970?

No.

It is the number of some duration unit passed since some time.

This may not sound useful, and a single reading of std::chrono::stead_clock arguably isn’t very useful. (Beyond, say, seeding a random number generator perhaps)

steady_clock readings are intended to be compared against other steady_clock readings. It is useful for measuring elapsed time.

The count() is only useful if you cast the duration to a known duration period.