But you've removed a standard reference point.
Without knowing where you are time becomes utterly meaningless.
You're correct 6pm happens at different times but it happens at the same point in each person's day so is understandable.
If you ever talk to somone who lives on the other side of the world "what time is it there" is a fairly normal.question that lets you know what's going on. With universal time asking them what time it is doesn t give you any new information and they have to then work out the time zone differnce and say which would be like X to you
This reminds of a time years back when I was in Las Vegas, I won a prize on something, (slot machine?), that gave me a free three minute phone call to anywhere on the Continent of the U.S., in other words, anywhere between Canada and Mexico, bordered by the two oceans.
At the time, all my American friends were New Yorkers, I excitedly called Myra, in Canarsie, Brooklyn.
After an interminable amount of rings she picked up, “Hello?”
I said, “Hi Myra, it’s Jean, how you doin’?”
She said, “Do you know what time it is?”
I checked my watch and said, “It’s five after midnight.”
She said, “It might be five after midnight where you are, but it’s five after three in the morning here!”
Talk about egg on face.