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

In PowerShell, the following shows branches on the remote that are already merged and at least two weeks old (the author:relative format starts displaying weeks instead of days at two weeks):

$safeBranchRegex = "origin/(HEAD|master|develop)$";
$remoteMergedBranches = git branch --remote --merged | %{$_.trim()};
git for-each-ref --sort='authordate:iso8601' --format=' %(authordate:relative)%09%(refname:short)' refs/remotes | ?{$_ -match "(weeks|months|years) ago" -and $_ -notmatch "origin/(HEAD|master|qa/)"} | %{$_.substring($_.indexof("origin/"))} | ?{$_ -in $remoteMergedBranches}