How to make Git log show all of today's commits?

Edit: Since this is the accepted answer I can't delete it, so I'm posting here @Simon's answer:

git log --since="6am"

And of course you can adjust the time to whatever is "morning" enough for you :)

Maybe the best is to use

git log --since="6am"

You can adjust the time to your convenience ;)

To get commits from all of today ...

git log --since=midnight