This script shows a grouped (by date), ordered commit list of multiple git repositories.

$CUSTOMERNAME-log

#!/bin/bash

allgits=`find ~/.cocoapods/CUSTOMERNAME ~/git/CUSTOMERNAME -name .git | sed 's_/.git__'`
filter=$*
filter="$filter --author=jerolimov"
filter="$filter --date=iso"
filter="$filter --after=2013-05-01"
filter="$filter --before=2013-05-31"

for i in $allgits
do
	cd $i
	git --no-pager log $filter "--format=%ai [`basename $i`] %s"
	cd - > /dev/null
done | sort | awk '{ if ($1 != p) { print p=$1; } $1="   "; print; }' | less

Example output.txt

2013-05-09
    15:46:15 +0200 [repo name] Initial project
    16:39:16 +0200 [repo name] Add stuff
    18:16:05 +0200 [just another repo] Do some other work
2013-05-12
    00:47:21 +0200 [just another repo] Finish work!
    01:37:01 +0200 [just another repo] Here too!