The problem is that the datetime/strftime documentation describes "%c" as:

    Locale’s appropriate date and time representation.

However, this is not really accurate (this is not the *default* behaviour), that's why I was mentioning the clarification. IMHO, a mere mere link to that caveats section would be enough.

Maybe looking at the locale section sounded intuitive to you because you're already familiar with it, but for people who don't KNOW that there's a caveats section there, it's not really obvious.