This should be added to `asctime` too.

The space-padded behaviour complies with the C standard which was the intent - after all, before it was using C `asctime` directly, and says that unlike C asctime, it doesn't have the newline character, meaning that as a rule, it should then behave similar to it, and only exception is marked.

Unfortunately MSVC asctime has been incorrectly using leading zeros (https://stackoverflow.com/q/53894148/918959).