Yeah, I meant explicit dates in the version. The releases aren't feature-based now, and haven't been since like the 2.4 series, or maybe even earlier. They just merge whatever's ready, do a few months of testing and bugfixing, and release. The first two version numbers (3.x) are literally meaningless outside of identifying the particular set of merges that happened during the merge window. I think that'd be better represented by a date.

That's a fair point that some distro shipping a 3-year-old kernel might look bad for PR purposes, even if it has patches backported.