Y.A. Photos Date Stamper is a free application that allows you to identify date and time the pictures were taken and add them to these pictures.
The interface of the program is rather simple. There are indications what exactly to do.
First you should choose Source folder of the pictures to be copied from and Destination folder for the pictures already with their dates.
You have a possibility to choose from plenty of date parameters, like font, color, format, transparency. You can even change JPG pictures resolution.
The software is quite useful, unless you have a camera with automatic date stamp.