From: Bryan Jacobs <b@q3q.us>
Date: Mon, 20 Jul 2015 00:03:50 GMT
Subject: git-subtree with log.date=relative
Message-ID: <20150719200350.10ae4534@q3q.us>

Dear git Developers,

When setting log.date=relative in ~/.gitconfig, all "git subtree push"
commands fail with errors like this:

git push using:  ../../repos/second master
fatal: invalid date format: 8 minutes ago
Can't copy commit 10827bbf18aa17108e07039d9c125000889a4365

I believe git subtree is making a call to git log and relying on the
dates in the output being machine-readable instead of human-readable.
It should pass --date=default if it wants to ensure the default date
format is used.

Bryan Jacobs