Check out filetime:
Returns a timestamp for the date and time of the last modification of the file filename. If no filename is specified, the function will refer to the currently read table file.
filetime( 'xyz.xls' )
Will return the timestamp of the last modification of the file xyz.xls.
Load *, filetime() as X from abc.txt ;
Will return the date and time of the last modification of the file (abc.txt) as a timestamp in field X in each record read.
Any function known for creation date?
Hm, I don't think there is a QV function for that. You could probably try calling system functions e.g. by use of a macro: