William Chargin 163b2c1377
env: drop --date=format:... to support Git 2.1.4 (#901)
Summary:
Git only learned `--date=format:...` in Git 2.6.0. Some old Docker
images have older versions of Git. It’s not too much work to reimplement
this particular bit of functionality, so this commit does so.

Test Plan:
Install Git 2.1.4 (as used on CircleCI): from the Git repository for
Git itself, run:

    git checkout v2.1.4
    make
    make install

Watch `yarn test --full` pass. Before this commit, `yarn unit` failed.

wchargin-branch: env-support-git-2.1.4
2018-10-01 18:07:52 -07:00
..