From the command line >>
Exiftool is a set of binary files that can be downloaded from:
http://www.sno.phy.queensu.ca/~phil/exiftool/
On a Mac I wrap the following line in a .sh (shell) script but can easily be done in a .BAT file for windows.
exiftool “-FileName<CreateDate” -d “%Y_%B_%d_%H_%M_%S.jpg” *.jpg
When this is run on any folder containing .jpg’s it will change the file name from:
IMG_0087.jpg to 2014_October_14_10_09_57.jpg
effectively renaming it to the second it was taken.
To shift by 5 hours and 30 mins it would be >>
exiftool “-DateTimeOriginal+=0:0:0 5:30:0” filename.jpg
A negative shift by one day would be >>
exiftool “-DateTimeOriginal-=0:1:0 0:0:0” filename.jpg