For MS Access textboxes on Forms that handle dates you can set the textbox to allow the user to optionally use a built-in DatePicker. However the DatePicker returns the date in a format set by the Windows system (e.g. as Set by Control Panel > Region > |Formats| > [Additional Settings ...] > |Date| > Short Date:)

If you use a unorthodox windows system date format, e.g. "yyyy-/MM-MMM/-dd, ddd" returning "2021/-05-May/-18, Wed" then this can be undesirably returned by the DatePicker.

Instead the DatePicker should return a date that honors any custom format set by in Format property of the Textbox control itself. E.g. If the developer sets an ISO8601 format "yyyy-mm-dd" in the Textbox format property then the DatePicker should return text like "2021-05-18".