Photo Dater is the ultimate program for placing date/time stamps on your photos. It works with bitmaps (BMPs), JPEGs, and GIFs.
You can customize nearly everything about the stamp, specifying your own format, position, size, color, and font. You can date a single file at a time, multiple files, or an entire folder.
The license of this software is Freeware, you can free download and free use this digital photo software.