In the US it’s OK to be a dumb Trump; in the UK it’s OK to be a loony Farage; in Germany it’s OK to be a compassionate Merkel...

You are reading far too much between the lines and that’s being smug and overly intellectual (ie you can see things that us dumb people can’t).

10 in decimal, 16 in hexadecimal. 0 is also a single digit!

In layman terms, they are probably interchangeable.

“time is displayed as one single digit, representing the number of seconds since 1970"