I have some photos where there is no suitable time or no time was set on the camera so the time that was assigned is wrong (and I don’t know what the real time/date should be.  How can I remove this field from these photos?  I see everywhere a way to make a batch change to time and date, but that assumes having one to change to.  I simply want to remove it.  (or put in a more general date like- December and year).

Thanks