Now I can fix that second date by changing the date on my computer. I'm not completely used to this mac yet so don't want to change too much like I could easily with Windows.
If I open it and just save it again under yet a different name, it changes all the dates to today. but preserved the rest of the exif.
I see how you can easily clean off the exif on this mac. Er no, I can't. There is a check in the box for exif when I go to save it. If I uncheck it and save under yet another name, all it does is change the orientation, preserves all the other original EXIF info. I thought you maybe could strip it off that way, but you still need a photo editor. iPhoto might do it or I could tinker around with various formats just using find, double clicking on the thumbnail and resaving in the various formats, then checking for exif. .bmp used to strip it off, also .tiff Ithink, but may preserve it now. That's one problem I've had making an album using some photos I saved in .bmp (.tiff takes up huge memory) and moving them over to the mac, exif is gone. So I go back to the original which I always preserve unedited and get it that way.
So an exif stripper might be more intuitive and useful for my son, but I have no need for one.
Open the photo and do a screen capture, or use Preview to grab a screen window, or selection. That should strip everything, but that is cheating, and the point was that fake location data could be put in the file.