The FAT file system uses a date system that starts from 1 January 1980, the fact that your files are showing as 31/12/1979 suggests that they have a date stamp of null or zero i.e. no date information available. Dependant upon the file there may or may not be some more information available in the file metadata. Try right clicking on the file select "Properties" then select the "Details" tab, there might be some information about when the photo was taken there.