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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.
Some cameras can deface your pictures by scrawling a string of numbers across them. Refer to your camera's manual.
If you require further assistance, please add a comment to your question and specify the model of your HP camera.