First, create this alias:
git config --global alias.today "log --since=midnight --author='Roberto Bonvallet' --oneline"
Of course, you have to replace my name with yours. Then, before leaving office for a well-deserved rest, you can reflect on what you've accomplished during your working day by issuing this simple command:
git today
Nice idea, you can avoid hard-coding your name like this:
Or if you just want to avoid typing it but still have it "fixed":