Canon SELPHY ES2 Beginner's Manual page 8

How to print with the date
Follow the instructions indicated below before selecting images.
Press
Select [Print Settings] in the menu screen and set the date
Press
Date setting with [On] is saved.
You can now select an image you wish to print with the date and
print it.

Press or to select [Print
Settings] and press
Press or to set [Date] to
[On].
.