Developer apps cydia launch release Timestamp, This tweak works with iOS 8 or higher. Timestamp jailbreak tweak lets you add a timestamp to photos in iOS Camera App. Once installed, your Camera application will apply a timestamp to the photos you take automatically so that the timestamp is shown from the Photos application. The timestamps can be fully customized to look a specific way by means of Photo Timestamp’s preferences, and can be moved on the fly by dragging them to a desired position on the photo. After instalation you can option to configure from Setting app.
If you are interested, then you can download Timestamp from the BigBoss repository in Cydia just $1.99. To install this program requires a jailbroken device (see if and how you can do the jailbreak to your iPhone by clicking here) and you need an Internet connection to download the package. This tweak is compatible with iOS 8.0 and later versions of the mobile operating system from Apple.