When viewing the question, the 'asked ## mins ago' gets updated to reflect the current time, but the 'joined' date does not:
To be clear, no this user did not ask and flag their question before joining the site, I checked.
It may be possible that I'm mistaken in the 'joined' date not updating while the other dates did (should've saved the html, in hindsight), and that the 'joined' date is simply incorrect for some reason.
If it is not possible to get an accurate joined time to display on this page, then please make the displayed date less fine grained (e.g. 'joined today') to not give a false impression of accuracy.