Has anyone else noticed that when time travelers grab you by your shoulders and ask what year it is, and you tell them, they don't reply, "Then I'm not too late," anymore?

That's rather concerning.

@spaf
That's concerning what? Please finish the sentence, thanks.
...unless you actually mean "disconcerting", in which case it's simply gawdawful English.

@DianeLevesque Out of curiosity... what variety of English do you speak?

I'm wondering if that objection is a British English thing or something?

https://www.merriam-webster.com/dictionary/concerning

causing concern or worry : creating reason for concern : troubling

Definition of CONCERNING

Definition of 'concerning' by Merriam-Webster

@skyglowberlin
I speak the version of English where "concerning" is a verb. I'm not aware of any version of correct English where it isn't.