hello Joe and thank you for your reply.
i've already try this solution but it's only renaming the folder with a second date in the folder's name (that's why i said there were 2 dates in the folder's name in my first message)
with checking or unchecking this option, it works only on the folder's name, not the scanned file. too bad !
i'm asking this because i'm loosing some time to rename each file before classify it.
so for example with my xerox 6015, i was scanning a first bill (once in recto, once in verso). the file was place in the folder xerox_{date+time} and named img-{date+time1}. i mooved this file in my folder named.... "furniture_bill_2018" for example, then a second bill ( img-{date+time2} ) , and third ( img-{date+time3} ) etc....
with the 6515 i bought for the recto verso mode (to save some time ;) ), i'm scanning a new first bill (new folder xerox{date1+time1} >> 0000001.jpg), move it to my "furniture_bill_2018" folder, then scanning a second bill (new folder xerox{date+time2} >> 000001.jpg) move the file in my "furniture_bill_2018" folder >>> and i must rename it because there is already a first file named 000001.jpg !
with 25 years of document binders to scan with each file to rename may take an eternity !!
if there is no solution, i hope xerox can read it and maybe there will be a new firmware ?
many thanks !