Creation and Modification Date

Hi,

i'd like to known because in some PDF file the Creation Date is later than the Modification Date.

For example:

Create Date                    07/07/2016 06:22:41 PM

Modify Date                    07/07/2016 05:22:50 PM

What do it mean? The file was modified and after save, such as a "new file", on  07/07/2016 06:22:41 PM ? The "original file" is that created  on 07/07/2016 05:22:50 PM?

Thanks

Francesco