[Bug 5650] New: Ability to use timestamp from GIT_AUTHOR_DATE

[mercurial-bugs at mercurial-scm.org]

https://bz.mercurial-scm.org/show_bug.cgi?id=5650

            Bug ID: 5650
           Summary: Ability to use timestamp from GIT_AUTHOR_DATE
           Product: Mercurial
           Version: 4.2.2
          Hardware: PC
                OS: Windows
            Status: UNCONFIRMED
          Severity: feature
          Priority: wish
         Component: convert
          Assignee: bugzilla at mercurial-scm.org
          Reporter: mojca.miklavec.lists at gmail.com
                CC: durin42 at gmail.com, mercurial-devel at mercurial-scm.org

I'm trying to convert a repository from git to hg with

    hg convert git-repo hg-repo

Git stores two different timestamps:
* GIT_AUTHOR_DATE
* GIT_COMMIT_DATE
(maybe the name of the variables is not 100% exact).

The problem is that I ran some repo modifications (some rebasing etc.) before
doing the conversion, so GIT_COMMIT_DATE has been changed to the time when I
did those modifications, while GIT_AUTHOR_DATE remains the same.

The conversion then used GIT_COMMIT_DATE (but GIT_AUTHOR_NAME!!!) as the source
of the data which is completely useless for me.

My workaround was eventually to run

    git rebase --committer-date-is-author-date <sha>

to modify the timestamps (luckily I have a linear history; I could probably
modify the timestamps in another way, but ...)

I would say that GIT_AUTHOR_DATE would make more sense in the conversion
anyway, but if you feel that GIT_COMMITTER_DATE is more useful as default, I
would like to request at least an option to fix that during conversion without
having to do acrobatics with git history first.

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