Check this topic https://forum.inaturalist.org/t/screenshot-photos/20812
If it’s a school project where users photograph someone else’s smartphone, you should ask them to not do that and upload own photos, sometimes such observations will have wrong date/time and it needs to be marked in DQA, but if you can see it was made on the scene where object was seen (e.g. in the background), it’s ok to not mark it in any way and just leave a comment.
If it’s just a user who uploads old photos from computer, compare EXIF with time observed, if it matches, it means user didn’t correct date/time of observation, so mark it as incorrect and leave a comment each time, then when/if user correct it – unmark those.
Sometimes people photograph their cameras to upload some rare observation on a spot, that is acceptable and likely user will replace photo later.
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