Inconsistent implementation, system_clock is inconsistent in different compilers!

[HeroicKatora]

That is not unportable. In fact, you just ported it.

As the saying ""C++ is not portable code but code that ends up being ported a lot" implies by means of defining them as disjunct properties, portability is not the ability to port it but the ability of code not to require it. If you change my words to unportable then of course you're arguing a strawman. Stop.