ExifTool is pretty much the Swiss army chainsaw for doing these kinds of things. It has a steep learning curve, but once you're over it, the kind of renaming you're after is a snap:
exiftool -d '%Y%m%d-%H%M%%-03.c.%%e' '-filename<CreateDate' .
The -d switch tells ExifTool to format dates according to the next argument's pattern. The pattern contains ...
For simple things where the flexibility, power, and complication of ExifTool aren't necessary, I like to use the tool jhead. It's a command-line tool available for Linux, Mac, and Windows.
jhead -n%Y%m%d-%H%M%S *.jpg
will automatically rename all files ending in .jpg in the current directory to a format like 20181226-111141.jpg. You can use %f to also ...
The number is called a "twin check". A number was assigned the roll of film. Usually assigned in the order opened at the sorting table. The prints made from that roll are given the same number. The 3R stands for 3X enlargement rectangular. This is likely a 3 1/2 x 5 inch print.
I use the following script, placed in ~/.local/share/nautilus/scripts (this should work for any Linux distro using Nautilus as a file manager):
exiftool -fileOrder DateTimeOriginal -recurse -extension jpg -ignoreMinorErrors '-FileName<CreateDate' -d %Y-%m-%d%%-.3nc.%%e "$@"
Doing it this way means I can select one or more files/directories ...
There is this great software for all Batch editing needs called "Faststone Image Viewer"
At first, select your images, open Tools → Change Timestamp.
You can choose either change File timestamp OR EXIF Timestamp (Date Time Photo Taken).
Adjust +/- hours and minutes OR Specify Specific Date OR Date and Time.
Push "Apply to Selected File(s)" button and the ...