Listing each branch and its last revision's date in Git

Question

I need to delete old and unmaintained branches from our remote repository. I\'m trying to find a way with which to list the remote branches by their last modified date, and

Answer 1

Just to add to the comment by @VonC, take your preferred solution and add it to your ~/.gitconfig alias list for convenience:

[alias]  
    branchdate = !git for-each-ref --sort='-authordate' --format='%(refname)%09%(authordate)' refs/heads | sed -e 's-refs/heads/--'

Then a simple "git branchdate" prints the list for you...