A free program for Android, by Master Apps Lab.

The Mark camera: Photo Timestamp is a camera app that allows you to add a date, time, and location watermark on your pictures and videos. It also includes the various date and time formats, as well as the current address, which gets automatically fetched when you take or record any video or photo at any location you’re visiting or traveling with your watermark camera.

You can choose from a variety of date and time formats to suit your needs.

Use the app to take high-quality pictures and videos, it is a simple app that lets you stamp date, time, and place on your pictures and videos captured with the Mark camera: Photo Timestamp.