Why would you want to have a date messing up your pictures? It's already in the EXIF data invisibly. Or do you mean a watermark stamp.....with the copyright symbol and your name and year? Date stamps are usually found on point and shoot cameras, and on prints from a developer.
The one time it might be worth using would be on baby pictures. leave room to crop it out for enlargements. but once the kids gets older you will be wondering when it was shot. you can't always rely on finding the original file in 20 years. Also grandparents you like to have the date on there. I ran a lab for years and a lot of my kids pictures will have the date printed on the back which has helped over the years.
Be warned the date stamp imprint on your pics is pretty vivid and orange and can really ruin a lot of your pictures, and its not easy to get rid of post snapshot.
I accidently left it on when taking some pics for a friends wedding (not professionally) and it's haunted me since
Another consideration is to add the date (and possibly other information) to the image when you save or print it. Check out this thread that discusses output options using Lightroom.
Print date or Date Stamp is working for my Nikon D5300 only when my image file output format is JPEG format and it does not happen when the image output is a combination like NEF (RAW) + JPEG (FINE).