Remind yourself of what you did over the past day and week by reading a summary of all of your git commits.

crontab

0 22 * * 1,2,3,4,5 /path/to/git_changes.sh /path/to/projects/ # Sends 5 PM EST if server time is UTC
0 21 * * 5 /path/to/git_changes.sh -w /path/to/projects # Sends Friday @ 4PM EST if server time is UTC

git_changes.sh

#!/usr/bin/env bash

# Changes 
# shebanged
# get author from .gitconfig & make that the recipient
# Instead of hard-coding the directory, make it an argument

if [ "$1" = "-w" ]; then
	shift
	mailing="weekly"
	since="1.week"
	format="iso"
else
	mailing="daily"
	since="1.day"
	format="relative"
fi

AUTHOR=$(awk -F "=" '/email/ {print $2}' ~/.gitconfig | tr -d '[[:space:]]')
PROJECTS_DIR=$1
RECIPIENT=$AUTHOR

output=""
for git in $(find  $PROJECTS_DIR  -maxdepth 2 -name "*.git"); do 
	gitdir=$(dirname "$git"); 
	cd $gitdir
	changes=$(git --no-pager log --date=$format --pretty=format:"%cd: %s" --decorate=short --author=$AUTHOR --since=$since); 
	if [ "$changes" ]; then
		output="$output\n$gitdir:\n$changes\n\n"
	fi
done

if [ "$output" ]; then
	if [ "$mailing" = "weekly" ]; then
		echo -e "$output" | mail -s "Weekly git commits update for week ending $(date +'%b %d')" $RECIPIENT
	else
		echo -e "$output" | mail -s "git commits for $(date +'%A, %b %d')" $RECIPIENT
	fi
fi

You could add --all to the git log to list commits on all branches, and not just the current one.