Reset the commit dates to their corresponding author dates

git-fix-dates

#!/bin/sh
# Reset the commit dates to their corresponding author dates, in the current
# branch. Usually useful to preserve the original timestamps after a rebase.
#
# This action is destructive to your repo's history and this should not
# be performed on a repo that has been shared with others, because it
# will force them to reset their history.
#
# Use at your own risk.
#
# Put the script in your path and invoke it this way:
# git fix-dates

echo "Reseting dates..."

git filter-branch --env-filter 'GIT_COMMITTER_DATE=$GIT_AUTHOR_DATE; export GIT_COMMITTER_DATE'

[[ $? -eq 0 ]] && echo Done!
[[ $? -ne 0 ]] && echo Error!