![]() However (according to Phil Harvey), "The -globalTimeShift option is needed only when you want to copy a shifted date/time value to another tag.", such as a -geo tag. Since no group is specified, EXIF:Artist will be written and all other existing Artist tags will be updated with the new value (' me '). Using exiftool, you would be able to run this command exiftool -wm cg '-DateTimeOriginal ![]() I wish to 'Copy Modified Date to Date Taken Only if Date Taken is Empty'. I have some photos missing the 'Date Taken' field. I am trying to 'clean up' my large photograph collection in the same way as mentioned in this thread. The -out specification gets inserted directly after the call to exiftool. 1,437 5 18 29 Just for clarity, can you run exiftool -time:all -a -G0:1 -s yourfile.jpg and give the exact 'date modified' tag (and group) you want to change mattdm at 14:06 mattdm - I imagine it would be File:System FileModifyDate. A common mistake is to think that exiftool is finding the source files (mp4 in this case) to copy to the target files (m4v) when exiftool is doing the reverse. I am very new to ExifTool and find it challenging to use command line to get done what I need to do. newJPG.jpg or (in a new directory), with -out. You can combine the above code with an -out file specification, like -out. The above code works to subtract 24 hours according to this Forum comment (by Phil Harvey): (I installed the latest version of EXIFtool 10.97) copy from terminal: Edwin-Macbook-2: Edwin /usr/local/bin/exiftool -AllDates1999:01:01 13:13:00. Exiftool has an -alldates parameter: exiftool -alldates-=24 -filemodifydate-=24 -filecreatedate-=24 *.jpg
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