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commit-in-the-past.adoc

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Commit in the past

Note
 This could be use to set any date to a commit (not only in the past)
Warning
 Using a date in the future could have unkown side effect on Github, Gitlab, …​

When dealing with a commit, git features both an author and a committer in order to keep trace of who wrote the code. Each of them have a name, an email and a date for each commit.

The authored date tracks when the code has been written while the comitted date tacks when it has been merged. In particular, when pushing a commit to a remote repository, the committed date is overwritten.

Everything can be overwritten using following environment variables:

GIT_AUTHOR_NAME
GIT_AUTHOR_EMAIL
GIT_AUTHOR_DATE
GIT_COMMITTER_NAME
GIT_COMMITTER_EMAIL
GIT_COMMITTER_DATE

It is also possible to overwrite the author date as follow while doing a commit:

git commit --date "<YYYY>-<MM>-<DD>T<hh>:<mm>:<ss>Z"

(see https://git-scm.com/docs/git-commit#_date_formats for more details about date format)

It can be done recursively from a specific commit <XYZ> (excluded) as follow:

git rebase -r <XYZ> --exec 'git commit --amend --no-edit --date="<YYYY>-<MM>-<DD>T<hh>:<mm>:<ss>Z"

Using prezto aliases:

gc --date "<YYYY>-<MM>-<DD>T<hh>:<mm>:<ss>Z"