To scan an after image file, you can use the following command:

rfutil db-name -C aimage scan [verbose] {-a ai-name | -ailist listfile} > output file name

It would be very handy when you can use a start date and end date in case of a very large AI file. 

For example:

rfutil db-name -C aimage scan [verbose] {-a ai-name | -ailist listfile} -startdate yyyy:mm:dd:hh:mm:ss -enddate yyyy:mm:dd:hh:mm:ss > output file name

Now we have to dump everything to an output file, open the file and search for the date and time. The output file could be very large. Perhaps too large to open.