git-log-to-tsv.sh

# Local Dates: 
git log --date=local --pretty=format:"%h%x09%an%x09%ad%x09%s" > commits.local.tsv.txt

# ISO Dates:
git log --date=iso --pretty=format:"%h%x09%an%x09%ad%x09%s" > commits.iso.tsv.txt

and if you had to do it for severals repo :

for each repo

git log --date=local --pretty=format:"%h%x09%an%x09%ad%x09%s" > ~/commits.local-<REPO_NAME>.tsv.txt

then to have them in a single file :

cat ~/commits.local-* > ~/all-repos-commits.tsv.txt