I'm not following. What does a hacking have to do with what dates of data are in your Quicken file?
Have you done a Window's search of your computer for any files ending in .QDF or .QDF-backup? They would be, respectively, Quicken-data-files and the backups for those files.When you find a QDF, try opening it to see what data is there. If you find a .QDF-backup, try using it as a Restore file in Q.