For git names just do the date it was built. Not as precise but easier to understand
A challenge with using the date is GIT is a moving target. Any version method used represents a snapshot moment of the repository. The GIT shortlog version better represents that snapshot moment than a date. A person could update a local repository but build a package set a week later. In that case the date would be incorrect.
If there was a way to pull a date from within the sources then a date could provide a better snapshot representation of the sources. But all Trinity packagers would need to use the same mechanism to pull the date to be consistent with one another.
Darrell