I want the date stamped on the picture.

To set the date and time on your camera, follow these steps:

Turn on the camera and set the language and date/time by following the instructions in the Extended User Manual.
Once you have set the date and time, you can turn on the Date Stamp feature by following the instructions in the User Manual . The date and time will be stamped on all pictures taken with this feature enabled.
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If your camera has this option it will be in the settings most likely time and date.
I see no mention of your camera type so here is the proccess on a Sony camera. SONY eSupport How to turn the date time stamp feature on or off

If you need further help, I’m available over the phone at https://www.6ya.com/expert/gregg_27a4d257e54e7920

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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You can stamp the date onto the picture after it's taken (the date will be the date the picture was taken, not the date it was stamped) by using the "Text Stamp" feature. Full details are in the "Text Stamp" section of the manual (page 90 in my copy). If you need a manual, you can download one at
http://service.us.panasonic.com/OPERMANPDF/DMCZS1.PDF

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.

I'm sorry it's not possible to add the date to the already taken picture on the camera. You could have it added in a software correction software.

In order to have the date and time on future pictures:
Menu
Camera Settings
Date Stamp (Icon is an old fashioned stamp)
Choose ON

Once the stamp is on the picture it's just like any other element of the picture. You can try to remove it using a photo editing program, the same way you might remove a telephone pole growing out of someone's head, for example. There is no magic feature that will automatically recognize the pixels making up the stamp and recover what was there originally when the picture was taken.

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...

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"

Unfortunately, the Date Stamp feature only works with the "Postcard (1600x1200)" setting. Change the shooting mode to Postcard and you can then turn Date Stamp on/off.