For techies who are #Quakers: a link to "en-US-Quaker.txt" with the diffs to apply to "en-US.ldml" to generate "en-US-Quaker.ldml" which can be used to get Windows to show dates in traditional Quaker form.
https://drive.google.com/file/d/11L_9PQpEJCtauyCAzjDeUA9AhiTjJK9B/view?usp=drive_link