[arch-general] Makepkg's versioning for git packages

I am a bit confused regarding makepkg's versioning of packages.

From what Allan said on this mailing list a couple of days ago, custom support is being added to makepkg. In addition, from what I can see on the wiki and manpages, the only variable influencing the versioning is pkgver. However, from what I've heard, when running makepkg with _gitroot and _gitname set, makepkg will automatically set pkgver to the date of the last commit.

Could someone clarify this? Also, the wiki pages regarding makepkg should mention this. Thanks, M