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Currently the Add Library window doesn't show a timestamp. It looks to me like a simple last modified file timestamp and it would certainly be nice to have it show in the Add Library window. I understand that just by looking at the artifact's versions we could tell which one is the latest, but sometimes these artifacts branch midway through using a different group id. In this case the timestamp would help show that it is the case.
The cases when one needs to see the timestamp are limited while the clutter effect of the date+time is fairly high
This old bug may not be relevant anymore. If you can still reproduce it in 8.2 development builds please reopen this issue. Thanks for your cooperation, NetBeans IDE 8.2 Release Boss