what i did last month

gistfile1.sh

====> .gitconfig
[alias]
        lsloglastmonth = log --pretty=format:"%ci\\ %C(yellow)%h%Cred%d\\ %Creset%s%Cblue\\ [%cn]%Creset" --decorate --after='last month' --before='today' --no-merges

====> .bashrc
function _funct_gitlog_last_month
{
  local lastmonth=`gdate '+%Y-%m-01' --date '1 month ago'`
  for n in */.git
  do
    local dirname=`dirname $n`
    cd $dirname 2>/dev/null >&2
    echo
    echo "=========> ${dirname}"
    git lsloglastmonth --since="${lastmonth}" --author="$(git config --get user.name)" | cat
    cd .. 2>/dev/null >&2
  done

  if [ -d .git ] ; then
    echo
    echo "=========> $(pwd)"
    git lsloglastmonth --since="${lastmonth}" --author="$(git config --get user.name)" | cat
    echo
  fi
}
alias gitlog-last-month=_funct_gitlog_last_month

===> usage
gitlog-last-month  | grep -v "2013-01"