How to Grab the latest file

I have been trying to use the find command to grab the latest file in a directory and move it to another area. I can't seem to get only that file, I end up getting everything for the day.

Any ideas?

Thank you

FILE=`ls -1rt | tail -1`
mv $FILE /tmp

Note that the ls command is "dash one arr tee" not "dash ell arr tee".