"Less than a minute from now."
Devs have addressed this in this sub-forum. It has to do with your computer clock. I don’t really remember the particulars.
I changed my forum time-indicator to show the actual time. (Clicking on the ‘minute ago’ changes it to the other format.)
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The forums look at the time registered in the database for a post and compare it with your computer clock to identify how long ago a post was made. If the two are out of sync it will read as if the post you are reading was made in the future.