How would you illustrate days progression within a month (elapsed days)?

I am looking for a visual way to display the elapsed and remaining days within a month without displaying a calendar.

Basically the purpose of the app is to reach a goal in a month time frame. So for info and motivation purpose I need to somehow display that you are at day 5 out of 31 days of a specific month in a visual way. (I looked into progress bars but it's not quite right).

Do you know any way of doing this?