The date and time (and a lot more) are stored with every picture in its EXIF metadata. Any photo viewing/editing program should be able to display this data. To print this data, please consult the documentation for whatever program you're using to print your pictures. Depending on the program and printer you may print the date on the image, in the margins, or on the back.
If you want the date stamped on the picture, obscuring what lies underneath, set the "Date Stamp" option as described on
this page of the user guide.
×