Thanks Phil, I've experimented some more. It appears that this command line works correctly: exiftool "-DateTimeOriginal+=0:0:0 0:2:10" /DIR. The problem is that Bridge does not update the time stamp or retain the label and rotation and corrected raw status UNTIL you further update the image in some way: ie give it a new label, rotate it, open it in Camera Raw, etc. Perhaps there is another exiftool command that would push the update on the data. The new date/time stamp is there but is not seen or read by Bridge until another command is given. Another way around this seems to be to just update all the xmp files but not the RAW files. Then when the two are reunited in a single folder Bridge immediately recognizes the new Date/time as well as the previous labels, rotations, correction, etc. Any ideas on how to do this in one step would be appreciated, and would probably help other users of Bridge. Thanks!