Previously, for dates older than 12 months we fell back to just giving the
absolute time. This can be a bit jarring when reading a list of times.
Instead, let's switch to "Y years, M months" for five years, and then just
"Y years" after that.
No particular reason on the 5 year cutoff except that it seemed reasonable
to me.
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>