This is not a feature of the photo lab but a feature of the camera.
Not all cameras have this feature.
But remember.......it is permanent.
Once you turn that feature on and take photos with it on, the date is included in those photo files as part of the picture. It can not be removed later.
I got an Olympus D-540Zoom and date and time cannot be imprinted on my photos when printed by a Photo Lab,no matter what I do in DPOF settings,but my sister-in-law's Sony Cybershot either a DSC-P73s or 93A can everytime we took the photos to be printed.The date or time are imprinted in red on her prints.Can anyone suggest anything?I'm now buying a Kodak Z740 5MP @ 10X Optical Zoom,which according to it's manual, it has a Date/Stamp option to include dates imprinted on your photos.I believe Samsung cameras also has this facility,which is very attractive indeed,why other manufacturers makes it hard for this great and wonderful feature to be included in all Digital Cameras as a Default not an option,beats me.
Thanks for any help in advance.