Namexif™ is a tool to automatically rename photos with the date they were shot. Digital cameras have their own clock and record the date to each photos with a precision of a second. Since the date and time is recorded for each photos (provided it is an EXIF compliant digital camera), Namexif™ is able to rename these photos according to the date. Doing so will:

make chronological order same as alphabetical one,

set a unique name to your photos

This is not so useful if you painstakingly rename all your photos as you take them off the camera, but very few people have that time or willpower.  This will at least help you organize your photos by knowing when they were taken at a glance of the filename.

Nameexif