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This question already has an answer here:

I have just noticed my cameras date has been wrong for the last month. However it is consistently wrong, so if I work out (or guess) the date and time of the first photograph, is there a tool that will work out the correct date/time of the rest of the images?

marked as duplicate by Michael C, MikeW, Paul Cezanne, AJ Henderson, John Cavan Aug 18 '13 at 15:05

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Yes — either ExifTool or Exiv2 will do this and can work on RAW files, including CR2. And they work on Linux, Mac, or Windows.

  • Do you know of a link with instructions on how to offset all Canon .CR2 files by a set amount (one hour) using ExifTool? – Michael C Dec 15 '17 at 9:47

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