How to edit format of calendar weekdays?

[chipit24]

I'm implementing the date picker component in Vue (https://primevue.org/datepicker), and with the default view of "date", it renders like this:

How can I change the format of the weekday values (i.e. Su, Mo, Tu, etc.)? This is rendered within .p-datepicker-weekday, but I don't see any weekday format prop or weekday slot. I would like to use the 3-letter abbreviation for the days of the week.