The digital Camera feature of Time stamping a picture is now available on your iPhone. Stampr, brings timestamps to the iPhone’s camera app. Not only can you now have a handy reminder of the date and time you took the photo, but you can also add custom text via the app’s settings.
After installing this app , it automatically adds Time Stamp to the picture when you take it.It give you both the options, with or without time stamp.
This Stampr Cydia App is available for free from Cydia.