When a date field in a PDF form is set to "read only" and the user tabs or clicks into the box and presses the down arrow, the calendar picker still pops up and allows the user to select a new date. This was tested by setting the field to "read only" via signature, and by setting it manually as well.

Tested in both Windows and Mac environment on the latest versions of reader and pro.

Expected result would be that the field remains completely uneditable when setting to read only.

Observed result when following the steps outlined above is that the date can be changed if set to read only.