In my never-ending quest to better summarize my work at the end of the day using computers, I discovered today the Git --author flag. It works like this:
$ glg --since=midnight --author=dev+jwworth+mikechau@hashrocket.com
* 4ba91a8 (HEAD, origin/checkout, checkout) Add guard for manual entry of employee discount
* 3a4e4c9 Seed a coupon and code and auto-apply in preview
* cb1adee Add discount
...
The alias glg is discussed here.
I use this when multiple developers or teams are committing throughout the day to the same repository, to disambiguate our work from others. Ready to paste into your billing software of choice.