delete-old-branches.sh

#!/bin/bash

now=$(date +%s)
two_years_in_seconds=$((2 * 365 * 24 * 60 * 60))
cutoff_date=$((now - two_years_in_seconds))

git for-each-ref --format '%(authordate:iso) %(refname)' refs/heads | while read line; do
  authordate="${line%% refs/heads/*}"
  authordate_unix=$(date -j -f "%Y-%m-%d %H:%M:%S %z" "$authordate" +%s)
  refname="${line##* refs/heads/}"

  if [ $cutoff_date -gt $authordate_unix ]; then
    echo "git branch -D ${refname} # updated ${authordate}"
  fi
done