The built_at attribute comes from the date field of
the gemspec. So if you pushed a gem today with a later date, it
works (you actually can't do future dates). This sounds to me like
it's working as expected...do you have any other questions about
Nick, sorry for the late reply and thanks your answer, it makes
sense. The rjaswal-geokit gem has no gemspec file (tough its
Manifest.txt file lists a geokit.gemspec file), that might the
cause of the behavior I observed.
Anyway was not a big issue, I'll close the discussion.