Isn't it also about as likely that the aliens will have an even more convoluted calendar, and may even consider ours simple?
It's some manner of borderline religious, faith-based notion about the assumed nature of aliens. People seem to get quite upset if you intrude on their fantasy about what aliens must surely be like (not like us, far better than us; humans are the primitive dredge of the universe basically). Despite the fact that there's no evidence to support either side of the premise, so it ends up revealing what the person thinks about themselves (self-hate) and humanity generally more than anything else.
And if you really want to see their heads explode, suggest the notion that the odds - as far as we know - are just as good that humans are the most advanced beings in the universe as not; and the odds are just as good that we're the very first spacefaring beings in the universe rather than the zillionth.
They managed interstellar travel, we did not. That inherently puts them at an advantage to us. Definitely a technological advantage. Hence it makes sense to assume (with medium confidence) that such aliens will be better at science than us. Assuming that they will therefore be more rational than us is not much of a leap.
Just the basic relativistic effects even with some type of instant transfers would make most communication and so on massively painful mess.
Perhaps extrasolar colonies will have to develop a system that makes sense for whatever planet or moon they settle on, at which point they'd be converting between Earth time and local time for correspondence.
It means some species that is/ was out there has an advantage. The species that actually visits us could be less intelligent than us but just intelligent enough to operate the equipment they dug up.
That is not a feature we share. We only occasionally make things better for all of humanity.