Show the Date stamp on the picture

Firts set the time and date

Go to "Setup" menu
Highlight "Date"
Display DATE menu
change yera. miont, day , hour
left menu

Time and date of recording is included with all pictures

taken with your Nikon digital camera.

try again , take a picture and look if show date time

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1. Press the Menu button.
2. If your camera displays a menu with tabs at the top:
a) Press the Right/Left buttons to highlight the Setup tab.
b) Press the Down button to highlight Date Stamp.
c) Press the OK button to add the date stamp to new pictures.
3. If your camera does not display a tabbed menu:
a) Press the Down button to highlight Date Stamp. NOTE: Depending on your model, Date Stamp might be within the Setup choice.
b) Press the OK button to add the Date Stamp to new pictures.

1. Press the Menu button.
2. If your camera displays a menu with tabs at the top:
a) Press the Right/Left buttons to highlight the Setup tab.
b) Press the Down button to highlight Date Stamp.
c) Press the OK button to add the date stamp to new pictures.
3. If your camera does not display a tabbed menu:
a) Press the Down button to highlight Date Stamp. NOTE: Depending on your model, Date Stamp might be within the Setup choice.
b) Press the OK button to add the Date Stamp to new pictures.

Press Menu, scroll down to "Date stamp" and across to select off, date or date and time, then press menu again. The date stamp only works in Postcard mode, so if you set a different picture resolution, that will also stop the pictures being date stamped.

In any mode, press the MENU button. Use up/down to highlight Setup (three horizontal sliders) and press the OK button. Use up/down to highlight "Date Stamp" and press OK. Make your choice and press OK. The date stamp will only appear on photos taken in the auto mode.

Enable the travel date option from Menu->Setup->Travel date. There are two options. SET and OFF. Choose set and exit the menu. Every picture you take from now on will display the date on which it was taken.

You haven't said what make/model your camera is, so it is hard to advise.

Without knowing the camera, I am guessing that you may be in the wrong mode when trying to change this setting. You won't be able to change it while reviewing pictures already taken. You can only change it for pictures to be taken subsequently. Once pictures are taken, you won't be able to add the date stamp, nor remove it if it has been stamped.

It may be that it won't allow you to set this if you haven't already set the date and time in your camera. I can't see why this setting would be shown at all if it was not possible to turn it on (i.e. if your camera did not have this feature).

Turning the date stamp off will only work for future pictures you take...The only way to remove the date on the pictures you have already taken is to do a crop or photshop the area...

Well, not really a solution. More like clarification.
Olympus does not provide a date/time stamp on pics taken with this camera (f310/x840), so, no solution, just knowledge....

Is there a way to select a group of pictures on the camera and give them all the same date and/or time stamp?
No
Each JPG will show the date on which it was taken, but not on the photo, it will show it on your computer under the column "date picture taken"