Great.
Hopefully you found the issue with your INFILE statement.
Note that the default display of dates by the ls command of Unix will display just the date for files that are over 6 months old. But the full datetime stamp is stored and newer versions of the ls command will allow you display the full date time value. Try this that works on RedHat Linux to get the value in the format that the SAS informat DATETIME can read.
/bin/ls -Al --time-style=+'%d%b%Y:%H:%M:%S'