You cannot display both the date and the day of the week in "Date" and "Date and time" fields.
Described below are the steps to create a drop-down field where you can specify a day of the week, and to manually select a day of the week that matches the date.

1. Place a drop-down field to the right of the Date field, and click Setting under the setting icon .
   

2. Set days of the week under Options, and then click Save.
   

3. Click Save Form on the upper left side of the screen, and then click Update App on the upper right side of the screen.