Hi,

The file system modification time as accessed by {{{modification-time}}}
is often wrong, e.g. when a project is newly cloned or if the file has
been copied in a sloppy manner.  At least if modification time suggest the
time that the file was edited by an author.

Sometimes vc can provide a better answer.  The attached patch tries to get
a sensible time from vc.

Caveats:
- There’s no customization.  I think that’s fine.  If someone feels
  strongly against this behavior a defcustom could be added or we could
  add another a macro, {{{vc-modification-time}}}.
- org-macs will depend on vc.  I don’t really see why this would be an
  issue as vc is bundled with Emacs.

I have only tested this with git, but it should work with other vc
backends to the extend that ‘parse-time-string’ can handle the way they
format dates.

WDYT?

Rasmus

-- 
Even a three-legged dog has three good legs to lose