First up: I'm using Windows 8.1 (Actually W10 TP, but it's close enough to 8.1).
I have roughly 32,000 pictures that I've taken over the last 7 years which 'mostly' have correct exif data.
Unfortunately when recently using some software to automatically sort these files into folders; I found out that at least 9,000 of these pictures have wrong or missing exif information for date-taken and/or date-created.
When right clicking on a file and loading properties / details tab, it looks like the "Date Modified" date and time is always (99% of the time) correct. (I'm willing to forgo correct info on that 1%)
Is there a way to automatically edit the "date-taken" and "date-created" information to reflect the "date-modified" information, without going through all 9,000 files individually and doing it myself?
Some pictures which have date taken information have incorrect modified information, so some way to skip images that already have correct "date taken" would also be appreciated.