How do I add a date and time stamp to my photos on an ios device

Sorry to hear you're having trouble.

First, I wanted to mention that as this is a Microsoft Forum we aren't able to help specifically with iOS devices and it would be best to ask via Apple's Support services or forums. That being said, I have checked and it seems that added a date/time is not natively available to the devices and that you would need to use a third party app to add them to your photos.