How to automatically decrease time of many photos in the album?

I have 2 sets of photos from 2 different cameras (600 photos in total) which I want to combine and arrange by date&time. The problem is that time in second camera was set 4 hours ahead than in my camera. For example photo from my camera has time stamp 18:47 while the photo of the same moment from 2nd camera has time stamp 22:47.
I want to do the following, automatically decrease time for photos from 2nd camera by 4 hours from the original time in the file. Doing it for 300 photos is a mess. Is there any way to do it automatically in iPhoto + Automator or some other Mac tool?
Thanks

You can simply create a Smart Album of the pics from Camera 2
File -> New Smart Album
Camera Model -> Is - > Name of Camera
This finds all the files with the wrong time.
Select them all (Command -a) then go Photos -> Adjust Date and Time
Regards
TD

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