Here is the easy way to auto-rename your JPG filenames of entire folders or single files directly from Windows Explorer (see Screenshot on the right).

1. Download the ExifTool by Phil Harvey (Windows Executable)
2. Unpack the file “exiftool(-k).exe” somewhere (e.g. to “C:\”)
3. Rename the file “exiftool(-k).exe” to “exiftool.exe”
4. Open “Start” > “Run” and type “shell:sendto”
5. Create a new Shortcut via right click: “New” > “Shortcut”
6. Select the “exiftool.exe” in the correct folder
7. Change the path to look exactly like this (except for the folder of course)

   C:\exiftool.exe -d %Y_%m_%d_%H_%M_%S%%-c-%%f.%%e "-filename<CreateDate"

8. Give the Shortcut a name (e.g. “Rename to EXIF-Date”)
9. You can now select JPG files or entire folders in the Explorer and rename them automatically via right click: “Send To” > “Rename to EXIF-Date”

Simple, isn’t it?

P.S.: If you want to change the format of your output date format, here is the reference for the parameters: http://www.sno.phy.queensu.ca/~phil/exiftool/filename.html#codes