Honestly, when I enter a project page I glance these to quickly evaluate how active the development is. E.g. for Ruby library when I see "9 years ago" everywhere then likely the code needs some work to get it working with the latest Ruby version. But when there is just one "2 months ago" on `lib` directory it tells me somebody came back here to maintain the things. I am not sure if list of accurately formated timestamps would be quicker to scan.

Regarding unmaintained projects, usually my next step is to check recent PRs list or Network Graph page to see if there is some more active fork.