Time stamps are an excellent design choice in your documenting, Take a close look at that circle stamp while you’re here. It was created with using it as a half-circle element in mind. You can use the months or the days along with the needed half of the days in numbers.
These are the same great images from the physical Time Will Tell stamps in digital form. Includes 27 digital stamps in PNG and ABR (PS brush) files only. Also included are PNG and PDF printable sheets that are sized the same as the physical stamps.
