Nellcor Oximax NPB-40 Operator's Manual page 60

NPB-40 Operation
7. Press the Menu button to set the minutes and display
the day set display. The day (29) will flash.
8. Press the Up Arrow button or the Down Arrow
button until the desired day is shown.
9. Press the Menu button to set the day and display the
month set display. The month (7) will flash.
52