The file timestamp is for your reference, and if you ever need to present the photo as legal evidence, is not sufficient. So what you do is this:
A) "Could not have been taken before" date - Get a copy of a daily newspaper with a SCREAMING ALLCAPS headline, like the New York Post, which will be easy to read in the image. Make sure that front page appears legibly in each and every photograph that you want to use for this purpose.
B) "Could not have been taken after" date - Print out the photos and get them notarized, with the stamp over part of each photo. Ask the notary to write the date with their signature. Many banks will do this for free.
You now have a printed photograph that could not have been taken before A or after B.
A) "Could not have been taken before" date - Get a copy of a daily newspaper with a SCREAMING ALLCAPS headline, like the New York Post, which will be easy to read in the image. Make sure that front page appears legibly in each and every photograph that you want to use for this purpose.
B) "Could not have been taken after" date - Print out the photos and get them notarized, with the stamp over part of each photo. Ask the notary to write the date with their signature. Many banks will do this for free.
You now have a printed photograph that could not have been taken before A or after B.
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